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Anthropologist, professor at the Federal University of São Paulo

Cientistas desenvolvem simulador de mídias sociais (Fapesp)

Criado por pesquisadores da IBM e do Instituto de Matemática e Estatística da USP, sistema possibilitará prever o impacto de ações de comunicação em redes como Twitter e Facebook

04/06/2013

Elton Alisson

Agência FAPESP – O poder de difusão e a velocidade de propagação das informações nas mídias sociais têm despertado o interesse de empresas e organizações em realizar ações de comunicação em plataformas como Twitter e Facebook.

Um dos desafios com os quais se deparam ao tomar essa decisão, no entanto, é prever o impacto que as campanhas terão nessas mídias sociais, uma vez que elas apresentam um efeito altamente “viral” – as informações se propagam nelas muito rapidamente e é difícil estimar a repercussão que terão.

“Se antes uma pessoa divulgava uma informação no boca-a-boca para mais três ou quatro pessoas, agora ela possui uma audiência que pode chegar aos milhares de seguidores por meio da internet. Daí a dificuldade de prever o impacto de uma ação em uma mídia social”, disse Claudio Pinhanez, líder do grupo de pesquisa em sistemas de serviços da IBM Research – Brazil – o laboratório brasileiro de pesquisa da empresa norte-americana de tecnologia da informação – à Agência FAPESP.

Para tentar encontrar uma resposta a esse desafio, o grupo iniciou um projeto em parceria com pesquisadores do Departamento de Computação do Instituto de Matemática e Estatística (IME) da Universidade de São Paulo (USP) a fim de desenvolver um simulador capaz de prever o impacto das ações de comunicação em mídias sociais com base nos padrões de comportamento dos usuários.

Os primeiros resultados do projeto foram apresentados no início de maio durante o 14th International Workshop on Multi-Agent-Based Simulation, realizado na cidade de Saint Paul, no estado de Minnesota, nos Estados Unidos e, posteriormente, no Latin American eScience Workshop 2013, que ocorreu nos dias 14 e 15 de maio no Espaço Apas, em São Paulo.

Promovido pela FAPESP e pela Microsoft Research, o segundo evento reuniu pesquisadores e estudantes da Europa, da América do Sul e do Norte, da Ásia e da Oceania para discutir avanços em diversas áreas do conhecimento possibilitados pela melhoria na capacidade de análise de grandes volumes de informações produzidas por projetos de pesquisa.

Segundo Pinhanez, para desenvolver um método inicial para modelar e simular as interações entre os usuários de redes sociais, foram coletadas mensagens publicadas por 25 mil pessoas nas redes no Twitter do presidente dos Estados Unidos, Barack Obama, e de seu adversário político, Mitt Romney, em outubro de 2012, último mês da recente campanha eleitoral presidencial norte-americana.

Os pesquisadores analisaram o conteúdo das mensagens e o comportamento dos usuários nas redes de Obama e Romney, de modo a identificar padrões de ações, a frequência com que postavam mensagens, se eram mais positivas ou negativas e qual a influência dessas mensagens sobre outros usuários.

Com base nesse conjunto de dados, desenvolveram um modelo de simulação de agentes – um sistema por meio do qual cada usuário avaliado é representado por programas individuais de computador que rodam integrados e ao mesmo tempo – que indica as probabilidades de ação na rede de cada uma dessas pessoas, apontando qual o momento do dia mais provável para publicar uma mensagem positiva ou negativa com base em seu histórico de comportamento.

Uma das constatações nos experimentos com o simulador foi que a retirada dos dez usuários mais engajados nas discussões realizadas no Twitter do presidente teria mais impacto na rede social do que se o próprio Obama fosse excluído.

“Esses resultados são preliminares e ainda não temos como dizer que são válidos, porque o modelo ainda é inicial e muito simples. Servem, contudo, para demonstrar que o modelo é capaz de mostrar situações interessantes e que, quando estiver pronto, será muito útil para testar hipóteses e responder a perguntas do tipo ‘será que a frequência com que o presidente Obama publica uma mensagem afeta sua rede social?’”, disse Pinhanez.

A IBM já possuía um sistema que permite a análise de “sentimento” – como é denominada a classificação do tom de uma mensagem – de grandes volumes de textos em inglês e em fluxo contínuo (em tempo real de informação), que a empresa pretende aprimorar para disponibilizá-la no Brasil.

“Estamos trabalhando para trazer uma série de tecnologias e adaptá-las para a língua portuguesa e à cultura brasileira, uma vez que o Brasil é o segundo país mais engajado em redes sociais no mundo, atrás apenas dos Estados Unidos”, afirmou Pinhanez.

Desafios

Segundo os pesquisadores, um dos principais desafios para a análise de sentimento de mensagens publicadas nas redes sociais no Brasil é que o português usado nessas novas mídias costuma não seguir as normas cultas da língua portuguesa, e isso não se deve, necessariamente, ao fato de o usuário não dominar o idioma.

“Existem convenções de como se escrever de maneira cool nas redes sociais”, disse Pinhanez. Por causa disso, um dos desafios no Brasil será o de incorporar o novo vocabulário surgido nesses fóruns.

Além disso, os textos são mais curtos e informais do que os publicados em sites de avaliações de filmes, por exemplo, como o do Internet Movie Database, em que os comentários são mais longos, mais bem formatados e rotulados.

“Com base nesse tipo de critério, podemos saber, de antemão, qual o sentimento do texto: se o usuário deu muitas estrelas para o filme é que ele está falando bem. E se deu poucas estrelas é porque sua avaliação foi negativa”, disse Samuel Martins Barbosa Neto, doutorando do IME e participante do projeto.

“A linguagem usada no Twitter é muito mais natural. Há muita expressão e variações de palavras, o que torna muito mais complicada a classificação das mensagens. Às vezes não se tem informação suficiente para assegurar que, de fato, um determinado tweet é positivo ou negativo, uma vez que ele não tem um rótulo que permita compará-lo com outros. Por isso, muitas dessas mensagens precisam ser rotuladas manualmente”, explicou Barbosa Neto.

Outro desafio é extrair dados das redes sociais. No início, o acesso aos dados das mensagens de redes, como o Twitter, era totalmente aberto. Hoje, é limitado. Além disso, o número de informações geradas por redes sociais cresceu exponencialmente, impondo aos pesquisadores o desafio de extrair mostras significativas de grandes volumes de dados para validar suas pesquisas.

“A rede do Obama no Twitter deve ter chegado aos 25 milhões de seguidores. Como podemos apenas extrair uma pequena parte desses dados, o desafio é garantir que eles não sejam enviesados – representando, por exemplo, apenas um nicho de seguidores – para gerar um resultado válido”, explicou Barbosa Neto.

Colaboração de pesquisa

Roberto Marcondes Cesar Junior, professor do IME-USP e orientador do trabalho de doutorado de Barbosa Neto, conta que o projeto de desenvolvimento do simulador de rede social é o primeiro realizado por seu grupo em colaboração com a IBM Research – Brazil.

O grupo do IME trabalha há dez anos no desenvolvimento de projetos de análise de dados usando modelos estatísticos em áreas como Biologia e Medicina, para descobertas de novos genes e de redes gênicas, por exemplo. E, mais recentemente, começou a desenvolver pesquisas para a aplicação de modelos matemáticos em Ciências Sociais.

“Ingressamos nessa área com o intuito de aplicar as mesmas técnicas matemáticas e computacionais em situações em que os dados provêm de alguma atividade humana, especificamente, em vez da ação de um gene ou de uma proteína, por exemplo, e vimos a oportunidade de trabalhar essas técnicas em redes sociais, que, do ponto de vista abstrato, têm muitas semelhanças com uma rede gênica, porque são redes que conectam elementos”, comparou Marcondes Cesar, que é membro da Coordenação Adjunta de Ciências Exatas e Engenharias da FAPESP e coordena o Projeto Temático “Modelos e métodos de e-Science para ciências da vida e agrárias”.

“Enquanto em uma rede gênica os elementos são os genes, que trocam informação bioquímica, em uma rede social os integrantes são os usuários, que trocam mensagens de texto”, disse.

A parceria com a IBM Research – Brazil, segundo Marcondes Cesar, possibilita implementar as ferramentas desenvolvidas na universidade. Para facilitar a realização do projeto, o estudante de doutorado orientado por ele foi contratado como estagiário pela empresa.

“Temos feito muitos projetos em parceria com universidades e instituições de pesquisa. Acreditamos muito em inovação aberta e atuamos bastante dessa forma”, disse Pinhanez.

Segundo Pinhanez, poucos grupos de pesquisa no mundo tentaram desenvolver um simulador de mídias sociais, em grande parte pela dificuldade de se montar uma equipe multidisciplinar de pesquisa.

“Acho que, pela primeira vez, a comunidade científica tem algo parecido com o mapa de quem conhece quem no mundo. É um mapa ainda incompleto, cheio de erros e enviesado, mas o nosso trabalho é uma das primeiras simulações de comportamento de um número tão grande de pessoas”, afirmou. “Antes, quando se fazia isso era, no máximo, com 300 pessoas, e era preciso ficar coletando dados por anos.”

O artigo Large-Scale Multi-Agent-based Modeling and Simulation of Microblogging-based Online Social Network, de Pinhanez e outros, pode ser lido nos anais do 14th International Workshop on Multi-Agent-Based Simulation.

Chimpanzees Have Five Universal Personality Dimensions (Science Daily)

June 3, 2013 — While psychologists have long debated the core personality dimensions that define humanity, primate researchers have been working to uncover the defining personality traits for humankind’s closest living relative, the chimpanzee. New research, published in the June 3 issue ofAmerican Journal of Primatology provides strong support for the universal existence of five personality dimensions in chimpanzees: reactivity/undependability, dominance, openness, extraversion and agreeableness with a possible sixth factor, methodical, needing further investigation.

Chimpanzee. New research provides strong support for the universal existence of five personality dimensions in chimpanzees: reactivity/undependability, dominance, openness, extraversion and agreeableness with a possible sixth factor, methodical, needing further investigation. (Credit: © anekoho / Fotolia)

“Understanding chimpanzee personality has important theoretical and practical implications,” explained lead author Hani Freeman, postdoctoral fellow with the Lester E. Fisher Center for the Study and Conservation of Apes at Lincoln Park Zoo. “From an academic standpoint, the findings can inform investigations into the evolution of personality. From a practical standpoint, caretakers of chimpanzees living in zoos or elsewhere can now tailor individualized care based on each animal’s personality thereby improving animal welfare.”

The study of chimpanzee personality is not novel; however, according to the authors, previous instruments designed to measure personality left a number of vital questions unanswered.

“Some personality scales used for chimpanzees were originally designed for another species. These ‘top-down’ approaches are susceptible to including traits that are not relevant for chimps, or fail to include all the relevant aspects of chimpanzee personality,” explained Freeman. “Another tactic, called a ‘bottom-up’ approach, derives traits specifically for chimpanzees without taking into account information from previous scales. This approach also has limitations as it impedes comparisons with findings in other studies and other species, which is essential if you want to use research on chimpanzees to better understand the evolution of human personality traits.”

To address the limitations of each approach and gain a better understanding of chimpanzee personality, the authors developed a new personality rating scale that incorporated the strengths of both types of scales. This new scale consisted of 41 behavioral descriptors including boldness, jealousy, friendliness and stinginess amongst others. Seventeen raters who work closely and directly with chimpanzees used the scale to assess 99 chimpanzees in their care at the Michale E. Keeling Center for Comparative Medicine and Research, UT MD Anderson Cancer Center in Bastrop, Texas.

The chimpanzees rated were aged 8 to 48, a majority had been captive born and mother-raised, and all had lived at the facility for at least two years.

To validate their findings, the researchers used two years worth of behavioral data collected on the chimpanzees. As the authors expected, the findings showed the personality ratings were associated with differences in how the chimpanzees behaved. The researchers also showed the raters tended to agree in their independent judgments of chimpanzees’ personalities, suggesting the raters were not merely projecting traits onto the chimpanzees.

Researchers suggest that one benefit to having the chimpanzees rated on the five core personality dimensions is that this information can now be used to make predictions that will help in their management, such as how individual chimpanzees will behave in various social situations. This type of information will help zoos better anticipate certain behaviors from various individuals, and will assist them in providing individualized care.

Journal Reference:

  1. Hani D. Freeman, Sarah F. Brosnan, Lydia M. Hopper, Susan P. Lambeth, Steven J. Schapiro, Samuel D. Gosling.Developing a Comprehensive and Comparative Questionnaire for Measuring Personality in Chimpanzees Using a Simultaneous Top-Down/Bottom-Up DesignAmerican Journal of Primatology, 2013; DOI: 10.1002/ajp.22168

‘Belief in Science’ Increases in Stressful Situations (Science Daily)

June 5, 2013 — A faith in the explanatory and revealing power of science increases in the face of stress or anxiety, a study by Oxford University psychologists suggests.

The researchers argue that a ‘belief in science’ may help non-religious people deal with adversity by offering comfort and reassurance, as has been reported previously for religious belief.

‘We found that being in a more stressful or anxiety-inducing situation increased participants’ “belief in science”,’ says Dr Miguel Farias, who led the study in the Department of Experimental Psychology at Oxford University. ‘This belief in science we looked at says nothing of the legitimacy of science itself. Rather we were interested in the values individuals hold about science.’

He explains: ‘While most people accept science as a reliable source of knowledge about the world, some may hold science as a superior method for gathering knowledge, the only way to explain the world, or as having some unique and fundamental value in itself. This is a view of science that some atheists endorse.’

As well as stressing that investigating a belief in science carries no judgement on the value of science as a method, the researchers point out that drawing a parallel between the psychological benefits of religious faith and belief in science doesn’t necessarily mean that scientific practice and religion are also similar in their basis.

Instead, the researchers suggest that their findings may highlight a basic human motivation to believe.

‘It’s not just believing in God that is important for gaining these psychological benefits, it is belief in general,’ says Dr Farias. ‘It may be that we as humans are just prone to have belief, and even atheists will hold non-supernatural beliefs that are reassuring and comforting.’

The researchers report their findings in the Journal of Experimental Social Psychology.

There is evidence from previous studies that suggests religious belief helps individuals cope with stress and anxiety. The Oxford University group wondered if this was specific to religious belief, or was a more general function of holding belief.

The researchers developed a scale measuring a ‘belief in science’ in which people are asked how much they agree or disagree with a series of 10 statements, including:

  • ‘Science tells us everything there is to know about what reality consists of.’
  • ‘All the tasks human beings face are soluble by science.’
  • ‘The scientific method is the only reliable path to knowledge.’

This scale was used first with a group of 100 rowers, of whom 52 were about to compete in a rowing regatta and the other 48 were about to do a normal training session. Those about to row in competition would be expected to be at a higher stress level.

Those who were competing in the regatta returned scores showing greater belief in science than those in the training group. The difference was statistically significant.

Both groups of rowers reported a low degree of commitment to religion and as expected, those rowers about to compete did say they were experiencing more stress.

In a second experiment, a different set of 60 people were randomly assigned to two groups. One group was asked to write about the feelings aroused by thinking about their own death, while the other was asked to write about dental pain. A number of studies have used an exercise on thinking about your own death to induce a certain amount of ‘existential anxiety’.

The participants who had been asked to think about their own death scored higher in the belief in science scale.

The researchers say their findings are consistent with the idea that belief in science increases when secular individuals are placed in threatening situations. They go on to suggest that a belief in science may help non-religious people deal with adverse conditions.

Dr Farias acknowledges however that they have only shown this in one direction — that stress or anxiety increases belief in science. They suggest other experiments should be done to examine whether affirming a belief in science might then reduce subsequent experience of stress or anxiety.

Journal Reference:

  1. Miguel Farias, Anna-Kaisa Newheiser, Guy Kahane, Zoe de Toledo. Scientific faith: Belief in science increases in the face of stress and existential anxietyJournal of Experimental Social Psychology, 2013; DOI:10.1016/j.jesp.2013.05.008

Estudo mostra que cotas não são o melhor instrumento para facilitar o acesso ao ensino superior (Jornal da Ciência)

JC e-mail 4741, de 06 de Junho de 2013.

Trabalho demonstra ainda que ações afirmativas podem encorajar a evasão e levar à redução da qualidade dos cursos mais competitivos

As cotas sociais ou raciais nas universidades não são o melhor instrumento para facilitar o acesso ao ensino superior, não garantem que os alunos cotistas tenham o desempenho esperado, além de encorajar a evasão e levar à redução da qualidade dos cursos mais competitivos. As conclusões são do estudo “Ações Afirmativas nas Universidades Brasileiras”, feito sob encomenda pela Academia de Ciências do Estado de São Paulo (Aciesp) e preparado por quatro especialistas na área de educação, os professores José Goldemberg, Eunice Durham, Maria Helena de Castro Guimarães e Simon Schwartzman.

O estudo foi apresentado hoje por José Eduardo Krieger e Regina Pekelmann Markus, presidente e diretora da Aciesp, respectivamente, e José Goldemberg, professor aposentado da Universidade de São Paulo (USP) e ex-ministro da Educação, em coletiva de imprensa no Centro Universitário Maria Antônia. Segundo Krieger, o estudo foi pedido porque há diversos aspectos que permeiam a questão do acesso dos alunos nas universidades públicas.

Uma das preocupações que o trabalho levantou é a formação educacional do cidadão até a entrada na universidade, que depende de diversas influências, como o ambiente familiar e a sociedade, além do Ensino Básico e Fundamental. Segundo o estudo, a educação no país requer uma reestruturação competente, que exigirá tempo e investimentos vultosos para que ela seja qualidade. “Este trabalho é importante porque nos traz dados que serão importantes para ampliar as discussões e tomadas de decisão”, afirmou Regina.

Para os autores do estudo, as cotas nas universidades introduzem um novo tipo de discriminação, como exemplo dos quais são a discriminação contra o branco pobre (em relação ao negro pobre) e contra o pobre (branco ou negro), cuja família economizou para mandar o filho à escola privada, para prepará-lo melhor para os vestibulares. “O critério ideal para a implantação de ações afirmativas deveria basear-se na renda per capita”, sugerem.

Eles reconhecem que a discriminação social ou racial no Brasil é real, mas não apenas no acesso às universidades públicas, e deve ser eliminada. “O problema é decidir como fazê-lo, sem prejudicar o desempenho das universidades públicas, cuja excelência é indispensável para o desenvolvimento do país”, escrevem nas suas conclusões. “A melhor solução a nosso ver é por meio de cursos preparatórios gratuitos para ingresso nas universidades, que utilizariam preferencialmente os alunos de pós-graduação como professores, e criando um sistema de bolsas de estudo para apoiar estudantes carentes.”

Para Krieger, enquanto isso não ocorre é preciso encontrar outras soluções para o problema, mesmo que paliativas para sanar as lacunas, sem prejudicar o que já está bom. “Em 30, 40 anos, sucateamos um sistema (de educação) que funcionava”, disse. “A educação de São Paulo já foi boa. Toda a minha formação foi feita em escola pública. E em tão pouco tempo tudo mudou. Hoje, eu não colocaria seu filho para estudar numa delas. A única coisa que não mudou foi a qualidade da USP.”

A professora Regina, salientou que é preciso que o governo faça investimentos, porque a universidade deve ser para todos. “Mas em que condições?”, indagou. “Por isso, é preciso dar condições para que todos tenham o mesmo acesso”. O ponto fundamental é a qualidade das universidades. “As decisões a serem implementadas não devem prejudicar o desempenho das universidades públicas, cuja excelência é indispensável para o desenvolvimento do país”, finalizou Goldemberg.

(Vivian Costa)

Fight Clubs: On Napoleon Chagnon (The Nation)

One anthropologist’s place in his field’s ongoing battle over questions of power, means and ends.

Peter C. Baker

May 15, 2013   |    This article appeared in the June 3, 2013 edition of The Nation.

In December 1919, Franz Boas, the German-born academic widely recognized as the father of American anthropology, published a letter in this magazine accusing four of his American colleagues—whom he did not identify—of having used their research positions as cover for engaging in espionage in Central America during the recently concluded war. Ten days later, the governing council of the American Anthropological Association voted 20 to 10 to censure Boas, claiming that his highly public letter was unjustified and in no way represented the AAA’s position. Boas was a founding member and former president of the association, so the censure was doubly humiliating; it essentially forced him to resign from both the AAA’s governing body and the National Research Council.

Noble Savages
My Life Among Two Dangerous Tribes—The Yanomamö and the Anthropologists.
By Napoleon A. Chagnon.

The Boas incident was the prelude to a century in which anthropology has been haunted by questions of means and ends. What sorts of alliances with power are worth it? What responsibilities (if any) do anthropologists have to the populations they study? Above all, to what extent has Western anthropology been fatally compromised by its associations—direct and indirect, public and covert—with a violent and imperial foreign policy? In several books, the anthropologist David Price has cataloged the substantial sums of money funneled from the military and intelligence community to academic anthropology over the years, as well as the contribution of American anthropologists to every significant war effort in modern US history. Most recently, ethnographers have joined the Army’s Human Terrain System program, designed to aid military operations in Iraq and Afghanistan by decoding the nuances of local culture. Price notes that although the revelation of these collaborations has often sparked heated short-term controversy, the disputes have passed without prompting broad, discipline-wide reform—or even conversation. After all, what anthropologist wants to spend time discrediting anthropology, a discipline that relies on trust, most importantly the trust of foreign governments and the subject populations that are the source of the discipline’s prized product of local knowledge? At what point are the ethical costs of doing anthropology too high, for ethnographers as well as the people they study?

That last question applies equally to anthropologists who may not work directly for the military or do fieldwork in areas explicitly labeled war zones. There is no better example than the career of Napoleon Chagnon, author of the bestselling anthropological text of the twentieth century, a slim volume called Yanomamö. Published in 1968, when Chagnon was 30, the book describes his fieldwork among the eponymous group of about 20,000 people who lived (and still live) in rainforest villages on both sides of the Venezuela-Brazil border. (Chagnon called them the Yanomamö, but most people who study the group call them the Yanomami.) Chagnon claimed—and now claims again in his recently published memoir, Noble Savages—that he arrived at his first Yanomami village in 1964 expecting to meet egalitarian natives living in harmony with nature and each other. This, he says, was what his University of Michigan anthropology professors had prepared him for. Instead, he found a way of life more reminiscent of Thomas Hobbes’s notion of the “state of nature”: an aggressive people mired in a cycle of inter-village combat, revenge begetting revenge and deception begetting deception. Death by murder was strikingly common, as was brutality toward women.

For Chagnon, the shock was immediate. No sooner had he and his guide arrived than they found themselves surrounded by “a dozen burly, naked, filthy, hideous men staring at us down the shafts of their drawn arrows! Immense wads of green tobacco were stuck between their lower teeth and lips making them look even more hideous, and strands of dark-green slime dripped or hung from their noses.” Whatever else might be said about this type of writing, with its blend of the lurid and the exotic, it appealed to American undergrads—or at least their professors assumed it did, and they kept assigning Yanomamö in Anthro 101. Before long, the book was in its second edition, then its third; a sixth came out last year. Chagnon has claimed, not unreasonably, that it has been read by as many as 4 million people, and it has certainly sold over 1 million copies. Unlike most other academic anthropologists, especially those writing in the 1960s, Chagnon brought lucidity and flair to his descriptions of fieldwork’s trials: the impossibility of staying clean and avoiding insects, the Sisyphean ordeal of trying to make a cup of oatmeal, the deep frustration of miscommunication, the loneliness. But it is obvious from reading Yanomamö that he also found the fieldwork to be a thrilling adventure. Trekking through the rainforest, a shotgun in one hand and a machete in the other; shooting tapir to roast over an open fire; building dugout canoes; forging friendships; tagging along for raids—Chagnon made cultural anthropology look more exciting than any textbook or tweedy professor’s lecture on kinship rituals. The book’s popularity has also benefited from the stylish films about the Yanomami that Chagnon made with the renowned visual ethnographer Timothy Asch.

In both the book and the films, there is a lot of fighting: chest-pounding matches, club fights, ax fights, raids, counter-raids, ambushes. Chagnon decided that Yanomami warfare was in large part about women, and specifically the question of who got to have sex with them. Women were regularly abducted from other villages during raids, and success in combat boosted a man’s social status, increasing his odds of securing wives for himself and his relatives. In order to reach this conclusion, Chagnon first constructed elaborate genealogies, tracing family trees across generations and far-flung villages to observe the relationship between blood ties and war patterns. This required not just learning the Yanomami language, but also overcoming his hosts’ frequent reluctance to supply the information he wanted. The most significant obstacle was a system of name taboos, including a prohibition against speaking a person’s name in that person’s presence and another against uttering the names of the dead.

The book was controversial from the start. Chagnon presented the Yanomami as a people living in the “state of nature,” untouched by the influence of modern civilization and nation-states, and so providing something of an undiluted example of humankind’s evolutionary ancestry. The possibility that these “primitive,” “Stone Age” people were killing each other not in competition over strategic resources, but specifically to improve their “reproductive fitness”—their odds of passing on their genes, either by reproducing themselves or by boosting the reproductive prospects of their relatives—was irresistible to proponents of the emerging field of sociobiology, which looks to natural selection to explain human social behaviors like altruism, the emergence of nation-states and war. The discipline’s recognition skyrocketed after the publication of E.O. Wilson’s influentialSociobiology: The New Synthesis in 1975; in subsequent editions of Yanomamö, Chagnon placed more emphasis on the role of biology in explanations of human behavior. For sociobiologists and their descendants, especially so-called evolutionary psychologists, such thinking was nothing short of a scientific revolution; for their detractors, among them cultural anthropologists, it was reductionist mumbo-jumbo at best, and politically dangerous at worst—the squeezing of the Yanomami and similar groups into categories crafted from Western assumptions to serve Western interests. The battles were heated and inseparable from competition over funding. The Yanomami became something of a prize token: for Chagnon’s defenders and critics, the fighting that occurred among this small group of people in the Amazon simply could not be what the other camp claimed it was, nor mean what the other side said it meant. Allegations of bad faith, often tinged with personal hostility, were as thick in the air as insects in the Amazon rainforest.

* * *

Even if the Yanomami are, or were, our “contemporary ancestors,” they live on land that is claimed by modern nation-states and happens to be rich in precious minerals. When the miners arrive, the Yanomami die, mostly from disease or poisonous chemical runoff, but sometimes also from shotgun blasts. During the 1980s and ’90s, anthropologists and indigenous rights groups became concerned about the possible effect that Chagnon’s theories might have outside the academy. This concern escalated after 1988, when Chagnon published an article in Science claiming that, among the Yanomami, men who killed other men also had the most wives and children. In 1989, the Brazilian Anthropological Association wrote to the AAA’s newsletter, arguing that Chagnon’s characterization of the Yanomami as a fundamentally “fierce people” (the subtitle of his book’s first three editions) was exaggerated to the point of falsehood, and less than helpful at a time when the Yanomami were under attack by miners and their allies in the Brazilian government, who were citing this supposedly endemic Yanomami violence as one of the reasons they should be segregated on twenty-one separate micro-reservations. As similar accusations circulated, it became increasingly difficult for Chagnon to obtain the permits required to do his work. In 1999, citing this obstacle, he announced his early retirement from the University of California, Santa Barbara, and returned to his home state of Michigan.

Around a year later, controversy about Chagnon’s Yanomami work reached a new level of scrutiny and public visibility, prompted by the publication of Patrick Tierney’s Darkness in El Dorado: How Scientists and Journalists Devastated the Amazon. Where previous Yanomami debates had rarely strayed beyond specialized academic venues, Tierney’s attack on Chagnon was published by W.W. Norton, a respected trade house, and garnered the attention of reviewers around the world. Tierney was at the time a journalist and indigenous rights activist; in Darkness in El Dorado, he took all the old complaints against Chagnon and wove them into a dramatic narrative of white men and the ruin they’d brought to the rainforest. His rogues’ gallery includes the French anthropologist Jacques Lizot, who for years used his store of foreign goods to pay Yanomami men and boys for sex. There was also the public television documentary crew that paid the Yanomami to dress and act differently (more “primitively”) than they otherwise would have—and then sat by, cameras rolling, while a young woman and her child died, despite having a motorboat that could have taken them to a hospital. There are miners and soldiers and corrupt politicians—and there’s Chagnon himself, whom Tierney portrays as the monomaniacal, violence-obsessed Colonel Kurtz of sociobiology, so entranced by the possibility of making a vital contribution to a beautiful, voguish theory that he lost all sight of Yanomami reality, research ethics and human decency.

In addition to rehashing—and, more than once, overcooking—the old accusations about Chagnon’s flawed assumptions, suspect methodology, dubious interpretations and their effects on the Yanomami, Tierney raised a new charge, one that seemed to dwarf the others in terms of its horror. The allegation related to a central aspect of Chagnon’s research program, one that had hardly been mentioned in his writings to date. The funding for Chagnon’s first few trips to South America came from the National Institute of Mental Health; but by 1967, Chagnon was collaborating with James Neel, a titan of modern genetics. Neel worked for the Atomic Energy Commission, the post–World War II agency created to study nuclear technology and its effects (including the infamous experiments in which Americans were exposed to large doses of radiation without their consent). As a geneticist, Neel saw the Yanomami as the closest link to our “evolutionary ancestors” he would ever get a chance to sample, an isolated population unaffected by industrialization or global conflict. Neel and Chagnon were both then based at the University of Michigan, and it was on Neel’s recommendation that Chagnon went to live with the Yanomami in the first place. Chagnon got AEC money; in return, whenever one of Neel’s teams wanted to collect blood and tissue samples, he served as their guide and translator.

* * *

Though Neel had little concern for the specifics of Yanomami life and (according to Chagnon) a disdain for anthropology in general, he sometimes went on the sample-gathering trips. On one, in 1968, a measles outbreak was erupting just as his team arrived. In the account presented in Darkness in El Dorado, Neel and his team—despite delivering a thousand vaccines—made the epidemic worse, causing many more Yanomami to fall ill and die than would have otherwise. This was not, Tierney insinuated in the pre-publication proofs of the book sent to reviewers, a matter of neglect; instead, Neel had knowingly made the epidemic worse because it gave him the perfect chance to observe the immune systems of a virgin-soil population in action. In this account, a founding figure of modern genetics comes across as little different from a Nazi scientist, with America’s bestselling anthropologist as his willing handmaiden.

After Norton sent out the proofs of Tierney’s book, his tale of killer anthropologists started circulating at great speed on academic listservs. It was a “nightmarish story,” wrote two of Chagnon’s longtime critics in August 2000, “a real anthropological heart of darkness beyond the imagining of even a Josef [sic] Conrad (though not, perhaps a Josef Mengele).” Chagnon’s partisans set in motion efforts to discredit Tierney’s book page by page, hoping to stem the inevitable tide of bad press. Allies like Richard Dawkins, Edward Wilson, Steven Pinker, Daniel Dennett and Marc Hauser e-mailed people covering the book, urging them to denounce it. In late 2000, an excerpt appeared in The New Yorker, and the book—though still not released—was nominated for a National Book Award. Meanwhile, Tierney and Norton continued editing it, softening some of its more incendiary claims about the measles epidemic; when released, it still claimed that Neel had made the epidemic worse, but allowed that it had not been intentional.

Sensing the possibility of a public relations disaster for the entire discipline, the AAA’s leadership convened a task force to evaluate Tierney’s charges. This was highly unusual: unlike a state medical or legal board, for example, the AAA is not a licensing body; you need not be a member of the association to practice anthropology. (Chagnon canceled his membership in the late 1980s.) It has little in the way of meaningful investigative authority, and its ethics guidelines are notoriously muddled and difficult to apply. The task force’s preliminary report, released in 2001 soon after the book’s publication, concluded that Tierney’s argument was shot through with flaws: the accusation that Neel had worsened the measles epidemic, as one example, was found to be baseless and not even possible. But many of Tierney’s less sensational, more complex charges against Chagnon were substantiated, and the task force declared that the book was of definite value to the field. This satisfied no one, not least because of an obvious procedural failing: two of the task force’s members admitted to not having read the whole report.

The final report, released a few months later, was considerably more critical of Chagnon. But for his detractors, it was at best an imperfect attempt to grapple with fundamental questions, and at worst a PR move designed to hurry the discipline past an ugly episode. For Chagnon’s supporters, it was a disgraceful hatchet job, one more sign of cultural anthropology’s resentment over the encroachment of “hard” science onto its turf. Three years later, a referendum was put forth to rescind the report, on the grounds that the original task force had been illegitimate, biased and sloppy. Roughly 10 percent of the AAA’s members voted: 846 for, 338 against. The report was removed from the organization’s website, and the question of which, if any, of its conclusions had been true was left for die-hards to debate in academic journals and on their personal websites. There is little agreement even about what the controversy is exactly, and most often the people involved—tenured professors—do little more than talk past each other, bemoan the quality of debate, and then continue talking past each other. Davi Kopenawa, a prominent Yanomami activist, put it well: “I want to know how much they are making each month. How much does an anthropologist earn?… This is a lot of money. They may be fighting but they are happy. They fight and this makes them happy. They make money and fight.”

There were two other referendums on the ballot when the AAA voted to rescind the El Dorado report. One expressed a strong preference for holding the annual meetings at facilities staffed by unions; it passed by a vote of 695 to 624. The other was a repudiation of the 1919 censure of Franz Boas, whose accusations about anthropologist-spies had since been confirmed by researchers—including the fact that some of the men who voted to censure him were the spies he had declined to name out of respect for their safety. The language of the 2005 repudiation implied that the original censure had been a regrettable error from another era, the sort of mistake anthropology didn’t make anymore and hadn’t made for a long time. It passed by an overwhelming margin: 1,245 to 73.

* * *

Chagnon’s retirement was not what he’d hoped for. In 2000, overcome by the stress of working to clear his name, but nonetheless seeing his alleged complicity with genocide become headline news around the world, he collapsed and was hospitalized. In subsequent years, he found it impossible to put the affair behind him:

I did not travel much, did not fish much, did not hunt grouse and pheasants over my German short-haired pointers, did not go to many concerts, did not read much fiction for pleasure, and did not spend more time with members of my family.

Instead, he set to work on a memoir. But he repeatedly scrapped what he’d written “because of the anger that kept creeping into my writing, giving it a very depressive tone.”

In Secrets of the Tribe, a recent documentary about anthropologists and the Yanomami, Chagnon responds to his critics mostly by repeating simplified versions of their charges in a sanctimonious tone. Despite his attempts to expunge the anger from his memoir, much of Noble Savages has a similar quality. As Chagnon sees it, his critics are a coalition of anthropological “ayatollahs” scrambling to protect their own authority from scientific rigor, “Marxist”-style “Thought Police” guarding the “politically correct” conventional wisdom, “postmodernists” unqualified to make claims about his conduct because they can’t even decide if the world exists, Catholic missionaries who wanted the Yanomami for themselves, and “barefoot” “activist” types less interested in studying the people of the world than in leading a witch hunt for the bad guy in the “office down the hall.” (The long history of overlap between American anthropology and the American military-intelligence sector is not mentioned.) These are the sorts of people, we are given to understand, who don’t care about what is true or not—the sort willing to smear a man to keep an ideology alive.

But Chagnon is in a bind: he’s written a memoir to refute the charges against him, but he finds the charges so baseless, and their existence so revolting, that he can barely be bothered to address them, or even to characterize them accurately. (In this sense, Noble Savages mirrors Darkness in El Dorado, which might have been more rigorous if Tierney hadn’t been so furious.) A telling example is Chagnon’s response to criticism from his fellow anthropologist Brian Ferguson. In 1995, Ferguson published Yanomami Warfare: A Political History, a book centrally concerned with countering Chagnon’s analysis of Yanomami life and violence. He disputed Chagnon’s interpretations of his own data (convincingly, I think), but also advanced a more fundamental objection: that the Yanomami had been in contact, direct and otherwise, with the “outside” world at several points long before Chagnon’s arrival, and that these moments of contact had influenced everything from where their villages were established to how they related to each other. Warfare was not the Yanomami historical norm, Ferguson said, and when war did break out, it had at least as much to do with the effects of encroaching nation-states and empires as it did with women and revenge. One crucial result of these moments of contact was the Yanomami’s acquistion of steel. Steel tools are many times more efficient than stone ones; when some villages came to possess more than others, it tilted the scales toward conflict, especially in times of hardship and deprivation, such as those caused by disease outbreaks (which even by Chagnon’s calculations were a more common cause of Yanomami death than violence).

Whatever the soundness and validity of Ferguson’s complex argument, it deserves more of a response than the single sentence that Chagnon has buried in an endnote: “Ferguson also claimed that I caused animosity, jealousy, and conflicts by the way I gave metal tools to the Yanomamö.” You can almost hear Chagnon snorting in disbelief. Because the endnotes lack corresponding numbers in the main text, the path the reader must take to them is unmarked. No reader will learn from Chagnon what Ferguson actually thinks. It is true that, in Yanomamö, Chagnon admitted to intentionally exploiting local animosities and conflicts to gain information, especially in his efforts to work past the Yanomami’s pesky name taboos. It is also true that Ferguson discusses Chagnon and other anthropologists’ habit of handing out steels tools in exchange for information, labor and blood samples. But to make this the centerpiece of his critique is absurd. It is also a measure of Chagnon’s narcissism that he reduces an argument about hundreds of years of history, empires and culture to an argument about himself. (Tierney is guilty of a similar fixation: when he cites Ferguson’s arguments in Darkness in El Dorado, he is also seemingly obsessed with the possibility that Chagnon himself had caused Yanomami warfare.)

The irony is that in Noble Savages, a story of an allegedly Stone Age people, steel and its influence are ubiquitous. One village Chagnon visited exists where it does, a missionary tells him, because its residents wanted to be near the missionaries and the steel tools they brought with them. His hosts lie to him about other villages—how far away they are, the dangers he can expect en route—so that he won’t leave and share his steel gifts with others. When he’s not watching, they break into his supplies and make off with knives and fishhooks. “The very word madohe [trade goods] stirs people,” Chagnon says. If machetes or axes are present, he observes, club fights can escalate to machete fights, increasing the likelihood of their participants being crippled or killed. Even after pointing all this out, Chagnon takes a position worthy of the National Rifle Association: machetes don’t kill Yanomami, Yanomami do.

Elsewhere in his memoir, though, he insists that the introduction of new technology can alter—and has altered—the way people relate to each other, even by encouraging them to kill each other. Missionaries from the Salesians of Don Bosco, a Catholic charity, gave shotguns to the Yanomami, something Chagnon refused to do “as a matter of principle.” The results, he says, were disastrous. “Although the shotguns did not make the Yanomamö warlike, I believe that they probably caused an increase in mortality rates…. Shotguns may have even made the Yanomamö more willing to attack their enemies because the shotguns were more efficient killing weapons than their bows and arrows.” And: “The introduction of shotguns at Salesian missions would most likely change traditional Yanomamö warfare patterns.”

The Salesians might be the only people Chagnon dislikes more than cultural anthropologists. From his perspective, they were determined to make the rainforest into a theocracy, controlling who came and went (including anthropologists) and luring the heathen Yanomami to their settlements so as to render them dependent on the goods they supplied. It was the Salesians, Chagnon theorizes, who pulled strings to get Tierney the permits he needed to do his research in the Amazon for Darkness in El Dorado. In 2010, he even speculated that they paid Tierney to write his book. As with the postmodern barefoot ayatollahs of anthropology, the Salesians are presented to us as ruthless Machiavellians. Chagnon all but accuses them of turning a blind eye to the inevitable result of their largesse: if the guns were being used for raids, or even making the raids more common, so be it—this would make the guns more valuable, and the missionaries with the guns more powerful still. So shotguns, it seems, can influence warfare patterns, but never machetes—and anyway, Chagnon writes, the Yanomami (a supposedly untouched people) had “possessed steel tools many years prior to my first trip.

Now and then, Chagnon will recognize that, yes, war is complicated, a cumulative result of many intertwined factors. He even draws attention to the difference between motive, on the one hand, and human statements about motive, on the other. If a Yanomami was bitten by a snake and died, Chagnon recalls, his fellow villagers might decide that the snake had been sent by a rival village—therefore providing a pretext for revenge, which might involve seizing control of some strategic resources. Such behavior should sound familiar: quite recently, the leader of the most powerful nation on earth organized the invasion of another, oil-rich nation, claiming that he was acting on God’s personal instructions. The leader of the invaders also pointed out that, in addition to possessing terrible new weapons, the oil-rich country’s leader had once tried to kill his father. Oil was never mentioned: the history of war is a history of obfuscation about its motives. But whenever the Yanomami tell Chagnon that they’re fighting over women, he takes it as a direct expression of fact—one that, conveniently enough, supports the theory that for the Yanomami, as for all our ancestors, warfare was essentially about reproduction and its kissing cousin, revenge.

* * *

For all his claims to be working in opposition to the archetype of the noble savage, Chagnon is implicitly committed to the idea that the Yanomami he met were in some sense completely different from us—that they lived, to borrow a phrase from the pop science writer Jared Diamond, in a premodern sliver of the “world until yesterday” preserved in our midst. The Yanomami are, at different points in Chagnon’s book, “wild,” “primitive” and “Stone Age”—never mind all their steel, or the fact that they rely on farming, not hunting or gathering, for 70 percent of their diet. Never mind that none of their primary crops—bananas and plantains—are indigenous to the Amazon or even South America. No, the Yanomami are “pristine,” “pure,” “special,” even noble: “I have chosen to call this book Noble Savages,” Chagnon writes, “in part because the Yanomamö I lived among had a certain kind of nobility that most anthropologists rarely see in acculturated and depopulated tribes that have been defeated by and incorporated into the political states in whose jurisdiction they reside.”

When it comes to describing the definitively unpristine Yanomami—those who, even by his standard, have had extended contact with “civilization”—Chagnon vacillates between pity, disdain and (most often) disinterest. Readers of Noble Savages will learn almost nothing of contemporary Yanomami or their politics. They will certainly not learn about the assemblies at which representatives from different villages discuss the ongoing threats to their existence posed by mining interests, and the future of their relationships with Venezuela and Brazil. Yanomami have even traveled to the United States—not just to speak about the Chagnon controversy, but also to request the return of the blood samples gathered by research teams, including those led by James Neel. The Yanomami argue that they never consented to the indefinite storage of bodily materials in far-away freezers, a practice that violates their burial customs. (In 2010, several research facilities agreed to return the blood.) Chagnon says not one word about any of this; he’s too busy calling Yanomami leaders the puppets of Salesian missionaries, who are using them to advance their anti-Chagnon, anti-science agenda.

Chagnon’s fixation on those Yanomami he judged “pristine,” and his disinterest in any he’d determined to be “acculturated,” took its most explicit turn in 1990, when he was contacted by Cecilia Matos, the mistress of Venezuela’s then-president, Carlos Andrés Pérez. As Chagnon tells it, Pérez’s political career was winding down, and Matos wanted him to beef up his legacy by doing something to benefit people like the Yanomami. Though Chagnon had started a Yanomami Survival Fund in 1988, there is no evidence that he ever delivered any money to the people it was named for. The one time he was asked for advice about safeguarding the Yanomami’s living conditions, Chagnon recommended a rainforest biosphere project that would protect their land—but not all of it, just those parts whose inhabitants Chagnon deemed sufficiently untouched. About four-fifths of Yanomami lands in Venezuela would be unprotected, and so more open to mining concerns.

This aspect of the proposal goes unmentioned in Noble Savages; all Chagnon says, in his three-page account of the incident, is that before the project could be implemented, the usual network of detractors went to work spreading lies, which prompted hysterical protests, and so the project died. He doesn’t say that a similar project that included almost all Yanomami land was launched the following year. More damningly, he doesn’t tell his readers that in 1993 Pérez was impeached, removed from office and jailed after getting caught siphoning millions of dollars’ worth of public funds to private accounts he shared with his mistress. Matos was to be arrested too, but she fled the country; on her arrest order, she was accused of, among other things, misappropriating state resources to get a noble-sounding biosphere project running as a front for more profitable activities. Almost every commentator on the Chagnon saga, even among his army of vociferous allies, has agreed that his participation in this project, however tangential, was at the very least bad judgment. In a recent New York Times Magazine profile, Chagnon swatted away such accusations. In exchange for his help, Pérez had restored his research permit. “I got a year’s worth of data,” he said. “It was worth it for that reason.”

At the end of the Secrets of the Tribe documentary, Patrick Tierney says, “I don’t think that there’s any way [Chagnon’s defenders] can salvage [him] in the long run.” Time will tell, but I’d wager that Tierney is wrong: he is too enamored of the idea that scandal might lead to change, and too optimistic about facts trumping ideology (which is, of course, what Chagnon claims to hope for, too). Chagnon’s basic conclusions about the Yanomami were cited uncritically in Jared Diamond’s bestseller The World Until Yesterday, published in December [see Stephen Wertheim, “Hunter-Blatherer,” April 22]. Early reviews of Noble Savages were almost all positive. In a triumphant blurb, the anthropologist Robin Fox calls it the “final knockout punch in a fight [Chagnon] didn’t pick but has most assuredly won.” Chagnon was recently asked by the University of Michigan, his alma mater, to organize his life’s work into a digital archive for use by academics around the world. And last year, he was voted into the National Academy of Sciences.

In response, his old University of Michigan professor Marshall Sahlins resigned from the academy, citing not only Chagnon’s election but also the recruitment of NAS anthropologists by the US military. “The two are connected,” he told me recently. “Chagnon’s research and the imperial venture are both based on the same assumption, that pursuit of material self-interest is the natural human condition—the obvious, natural, best thing for the individual and the nation.”

Online, Chagnon’s fans have been selling T-shirts that caricature his critics’ positions as: Napoleon Chagnon kicked my dog! Word is the man himself thinks they’re hilarious and has ordered a bunch for friends and family. This semester, at age 74, Chagnon joined the anthropology department at the University of Missouri. “I feel like a battleship,” he told the campus newspaper, “shaking off the mothballs and taking to the high seas again.” Let’s christen it the USS Machete.

In “Library Man” (Feb. 7, 2011), Thomas Meaney reviewed Patrick Wilcken’s biography of Claude Lévi-Strauss, “a poet in the laboratory of anthropology.”

Read more: http://www.thenation.com/article/174369/fight-clubs-napoleon-chagnon#ixzz2VSi1oT30

Subcommittee Reviews Legislation to Improve Weather Forecasting (Subcommittee on Environmen, House of Representatives, USA)

MAY 23, 2013

Washington, D.C. – The Subcommittee on Environment today held a hearing to examine ways to improve weather forecasting at the National Oceanic and Atmospheric Administration (NOAA).  Witnesses provided testimony on draft legislation that would prioritize weather-related research at NOAA, in accordance with its critical mission to protect lives and property through enhanced weather forecasting. The hearing was timely given the recent severe tornadoes in the mid-west and super-storms like Hurricane Sandy.

Environment Subcommittee Chairman Chris Stewart (R-Utah): “We need a world-class system of weather prediction in the United States – one, as the National Academy of Sciences recently put it, that is ‘second to none.’ We can thank the hard-working men and women at  NOAA and their partners throughout the weather enterprise for the great strides that have been made in forecasting in recent decades.  But we can do better. And it’s not enough to blame failures on programming or sequestration or lack of other resources. As the events in Moore, Oklahoma have demonstrated, we have to do better. But the good news is that we can.”

Experts within the weather community have raised concern that the U.S. models for weather prediction have fallen behind Europe and other parts of the world in predicting weather events.The Weather Forecasting Improvement Act, draft legislation discussed at today’s hearing, would build upon the down payment made by Congress following Hurricane Sandy and restore the U.S. as a leader in this field through expanded computing capacity and data assimilation techniques.

Rep. Stewart: “The people of Moore, Oklahoma received a tornado warning 16 minutes before the twister struck their town. Tornado forecasting is difficult but lead times for storms have become gradually better. The draft legislation would prioritize investments in technology being developed at NOAA’s National Severe Storms Laboratory in Oklahoma, which ‘has the potential to provide revolutionary improvements in… tornado… warning lead times and accuracy, reducing false alarms’ and could move us toward the goal of being able to ‘warn on forecast.’”

The following witnesses testified today:

Mr. Barry Myers, Chief Executive Officer, AccuWeather, Inc.

Mr. Jon Kirchner, President, GeoOptics, Inc.

“O governo está preparando uma tragédia”, afirmam indígenas (Xingú Vivo)

29/5/2013

A situação é grave na Usina Hidrelétrica Belo Monte. Os indígenas que ocupam pelo terceiro dia e pela segunda vez no mês o principal canteiro da barragem temem que uma tragédia de grandes proporções aconteça, com a autorização judicial da entrada da polícia para efetuar o despejo. Para eles, o governo está ameaçando repetir o confronto ocorrido na aldeia Teles Pires em novembro do ano passado, onde a Polícia Federal assassinou um indígena Munduruku e deixou dezenas de outros feridos.

Em coletiva à imprensa, Candido Waro declarou que os indígenas ocupados não irão cumprir a reintegração de posse. “Nós não vamos sair. Nós vamos morrer aqui, o governo vai matar todo mundo”, afirmou a liderança munduruku em coletiva à imprensa. O indígena reafirmou que o governo não tem cumprido com as exigências constitucionais no processo de consulta.

“O governo está preparando uma tragédia”, afirma Paygomuyatpu Munduruku. “Nós não vamos sair daqui. O governo tem nos ignorado, ofendido, humilhado, assassinado”. Para ele, está claro que o governo está tentando sufocar o movimento. “Ele já matou uma vez e vai matar de novo. Eles mataram porque nós somos contra as barragens”, explica. Os indígenas se mostraram “ofendidos” com a declaração do ministro Gilberto Carvalho à rede Globo de que ele não teria sido “comunicado oficialmente” sobre a vontade dos Munduruku de se reunirem com o governo federal.

VIOLÊNCIA POLICIAL

Além da pressão do governo federal, os indígenas têm sofrido diariamente ameaças e intimidações dos policiais que residem no canteiro de obras, e daqueles que estão cercando o empreendimento. O vídeo abaixo, registrado por um indígena dentro da ocupação, mostra um policial intimidando e ameaçando os manifestantes, ao apontar armas e dizer que vai “quebrar” um indígena.

Para o grupo que ocupa o canteiro, a única saída é que o governo federal, na figura do ministro Gilberto Carvalho ou da presidente Dilma Rousseff, vão ao canteiro e se comprometam a cumprir a pauta dos indígenas. Eles exigem a suspensão de todos os estudos e obras de barragens que afetem seus territórios até que sejam consultados como previsto por lei.

Confira a entrevista do antropólogo Renzo Taddei sobre o processo de licitação do Maracanã (Yahoo! Esporte Interativo)

Autor de estudo sobre torcidas organizadas, Renzo comentou tentativa infundada dos dirigentes do futebol brasileiro em erradicar as torcidas organizadas

Por Amanda Duarte, Gabriel Mansour e Pedro Muxfeldt | Yahoo! Esporte Interativo – ter, 28 de mai de 2013 02:22 BRT

Autor de diversas pesquisas sobre o fenômeno das torcidas organizadas no Brasil e na Argentina, o antropólogo Renzo Taddei falou com exclusividade ao Yahoo! Esporte Interativo sobre a proposta de elitização do público do Maracanã contida no estudo de viabilidade econômica realizado pela IMX Venues.

Professor da Escola de Comunicação da Universidade Federal do Rio de Janeiro (UFRJ), Renzo também falou sobre a proposta de transformação do estádio em centro de entretenimento e, estudioso do assunto, enxergou conexão entre a política de aumento do valor dos ingressos com a tentativa de exclusão das organizadas dos estádios de futebol, algo que, para o acadêmico, não acontecerá da maneira prevista devido às ligações próximas entre as diretorias de clubes e suas torcidas e uma falha na visão que os comandantes do futebol e a mídia têm dos grupos de torcedores organizados. Confira a entrevista na íntegra:

Yahoo! Esporte Interativo: O estudo de viabilidade econômica do complexo do Maracanã prevê, textualmente, a “mudança do perfil do público e consequente aumento do valor médio dos ingressos”. Qual sua visão sobre esse processo de elitização do público dos estádios que já vem ocorrendo?

Renzo Taddei: Não está claro ao que exatamente o estudo se refere: se ao aumento da renda das classes populares, o que significa que o público se mantém o mesmo, ainda que seu “perfil” de consumo mude, ou à substituição das classes populares por classes médias e ricas, via encarecimento dos ingressos. Essas alternativas não são excludentes; em termos financeiros, podem até levar aos mesmos resultados. Em termos sociais e políticos, no entanto, são coisas muito diferentes.

Existe uma distinção importante a ser feita: uma coisa é um investimento privado ser economicamente viável, outra é uma política pública ser democrática e eficaz. Infelizmente o governo do Rio de Janeiro parece confundir as coisas: permitir que a iniciativa privada elabore políticas públicas é mais do que um erro político, é um tiro no próprio pé. No Brasil, como em diversos lugares do mundo, o futebol é muito mais do que um negócio, tem um papel importante na vida de muitas coletividades; o que o governo tem dificuldade de enxergar é que reduzir o futebol a um mero bom negócio pode ter consequências sociais funestas.

O futebol poderia ser um instrumento poderosíssimo na construção de uma sociedade melhor, dada a penetração que tem em diversos públicos e setores da sociedade. Para isso, deveria ser usado em conjunção com políticas públicas sérias e inteligentes. Se os gestores públicos soubessem usar o futebol com inteligência, seria possível até argumentar que ele deveria ser subsidiado. Mas, infelizmente, já há muitas décadas o futebol é controlado por interesses financeiros pouco comprometidos com objetivos e metas sociais maiores; a forma como o dinheiro que vem da transmissão televisiva define os rumos do esporte mostra como este é refém do mercado.

Ao usar critérios mercadológicos para julgar o valor de uma boa ideia, o governo permite que o apartheid social brasileiro se estenda às políticas sociais nas áreas de lazer e cultura.

Y!EI: Em outros pontos do estudo, fala-se na necessidade de transformar o complexo esportivo do Maracanã em “centro de entretenimento”. Que efeitos sociais a transformação de um símbolo cultural do Rio de Janeiro como o Maracanã em abrigo de shoppings e hotéis, como está previsto no estudo, podem causar?

RT: Colocando de forma direta, trata-se da transformação do mais importante espaço de comunhão que temos no Brasil em mais um espaço de segregação. A atratividade financeira do projeto faz com que nossos governantes se façam cegos ao papel simbólico do futebol, através do qual se dá um bocado da vida social das pessoas desse país, em todas as suas regiões e de todas as classes sociais. O futebol une gente que em outras ocasiões encontra-se separada em credos e partidos políticos distintos – credos e partidos que, via de regra, não funcionam com base em regras claras e conhecidas por todos, e num contexto em que os jogos sempre começam do zero a zero e o fair play é valorizado.

Ainda que não intencionalmente – ou, quem sabe, intencionalmente -, shoppings centers e hotéis são espaços de segregação, onde descamisados e gente de chinelo não entra. Aqui estou falando das dimensões simbólicas do futebol; vai da solução arquitetônica mesclar isso tudo e ver até onde o espírito do futebol vai ser descaracterizado.

De qualquer forma, para que um hotel exista num estádio haverá que se instalar barreiras e restrições à mobilidade das massas que hoje não existem. Não vejo como o resultado possa ser bom, em qualquer dimensão que não seja estritamente financeira, e apenas para quem vai investir no projeto. Em minha opinião, essa é apenas mais uma etapa do processo, apoiado pela Fifa, pela CBF e pelas federações estaduais, que transforma o futebol em refém do capital financeiro. Só não vê que parte do comportamento das torcidas é uma reação negativa a isso tudo quem não quer – e há um bocado de gente em postos importantes que efetivamente não tem qualquer interesse em enxergar isso.

Basta seguir os perfis das torcidas em redes sociais e ver a forma como elas se manifestam contra o que chamam de “futebol moderno”, que é nada mais do que o futebol refém do capital financeiro – das verbas de patrocínio que definem regras e formas de funcionamento do esporte, dos contratos que induzem os jogadores a estabelecerem relações muito superficiais com os times em que atuam, dentre muitas outras coisas.

Y!EI: Já nos dias de hoje, jogos às vezes de pouco apelo dos campeonatos estaduais, por exemplo o Carioca, têm ingressos com preços que chegam a R$ 80. Neste cenário, são nas torcidas organizadas onde mais se concentram integrantes das classes mais pobres da sociedade. O processo de “demonização” das organizadas pode ser entendido como um outro passo para a retirada da população pobre – especialmente jovem e negra – dos estádios?

RT: Sem dúvida. Mas isso só se dá porque há uma compreensão muito ruim, por parte do poder público e da mídia, de como funcionam as torcidas organizadas. Elas nunca deixarão de estar nos estádios, porque na maioria das vezes suas lideranças não pagam os ingressos. Há uma relação entre os clubes e as torcidas que não está considerada nessa abordagem econômica, porque esse é uma questão da política interna do futebol.

Os próprios dirigentes facilitam a entrada das organizadas, porque elas são parte fundamental do fenômeno e do espetáculo que é o futebol, e os jogadores e dirigentes reconhecem isso. É mais fácil ver isso quando se joga de visitante: muitas vezes quem vai ao jogo é apenas a torcida organizada, que viajou mil, dois mil quilômetros, em veículos mal conservados e lentos, apenas para assistir o jogo e voltar para casa.

Num estádio hostil, uma torcida atuante, que canta e demonstra apoio ao time pode afetar positivamente o estado psicológico dos jogadores do seu time – não há jogador ou técnico que não reconheça isso.

Por outro lado, é equivocado achar que os torcedores mais pobres estão nas torcidas organizadas. Algumas torcidas têm um faturamento alto, de atividades legais. O que se está confundindo aqui é a forma como as elites pensam o mundo, com seus maniqueísmos e preconceitos, e a forma como o mundo do futebol efetivamente existe; as duas coisas não são equivalentes, obviamente. O futebol não se resume à divisão de classes sociais, exatamente porque em grande parte do tempo funciona como elemento de comunhão social, e não de divisão. Transformar o futebol de acordo com a visão que as elites têm da divisão de classes sociais é assassinar o espírito do esporte, o que pra mim deveria ser crime inafiançável.

Veja também:

– Especial Maracanã PARTE 1: Empresa de Eike prevê mudança no perfil do público
– Especial Maracanã PARTE 2: Sociólogo analisa processo de elitização
– CBF não vai liberar Neymar para jogo de despedida na Vila Belmiro

‘Beautiful Game’ becomes ‘Pricey Game’ with World Cup, Confed Cup changing Brazilian soccer (Washington Post/AP)

By Associated Press, Published: May 28

RIO DE JANEIRO — It’s an image as Brazilian as Carnival or Rio’s Christ the Redeemer statue.

Drummers pound out a Samba rhythm. Swaying to the beat, fans sing and saunter up and down the aisles waving flags the size of bedsheets, seeming oblivious to the match below.

Little by little this picturesque mayhem in Brazilian soccer stadiums is disappearing, and ticket prices are soaring despite the toned-down version being sold.

The “Beautiful Game” has become the “Pricey Game.”

This year’s Confederations Cup and next year’s World Cup, the first in this South American country in 64 years, are speeding the changes. The national game is getting a different look with the use of numbered seating, a transformation that’s been going on for several years.

This might seem like a small thing, but it’s big in Brazil.

For decades, Brazilians simply raced into the stadiums and grabbed the best spots — some sitting, others standing in a crush amid thousands of others. At the Confederations Cup and World Cup, the seats will be assigned, and they won’t come cheaply. As an example, the least expensive seats for Sunday’s exhibition game between Brazil and England — the first major test event at Rio de Janeiro’s renovated Maracana Stadium — will be 90 reals ($45).

That’s 30 times more than the cheapest seat eight years ago at the historic stadium.

The Brazil-England match comes only days before the opening of the Confederations Cup, the eight-team warmup for the World Cup that starts on June 15. Maracana is the venue for the title game June 30 — and the World Cup final.

“The giant price change means there is a shift concerning the kind of people that are going to the new stadiums,” said Erick Omena de Melo, a native of Rio de Janeiro who is working on a doctorate in city planning at Oxford University in England. “It was previously a much more diverse place in the stadiums. But as the economy in Brazil changes, they are converting these stadiums to a much more middle-class, upper-middle class or even upper-class place that is much less for the lower-middle class and poor.”

Traditional general admission is being eliminated with luxury boxes and modern seating taking over at the six stadiums being used for the Confederations Cup, and the additional six that are to be ready for the World Cup. This change has already filtered down to the country’s heavily indebted club teams and is sure to take some of the spontaneity out of what Brazilians call “futebol” (pronounced foo-chee-BOHL).

Brazilian fans used to play a major role in the drama. These days they’re staying away. Average attendance for matches in Major League Soccer in the United States is higher than attendance for first-division matches in Brazil, which likes to call itself the “Home of Football.”

“What’s being done so far is transferring a European model to Brazil,” said Omena de Melo, who is working on a book about the social history of Maracana. “But Brazil is really different. It’s a totally different atmosphere at a football game. The changes are seen by many as a huge aggression against the traditional fans, the traditional crowds at football matches.”

Officials counter that ticket prices in Brazil are still below European levels, and that new and refurbished stadiums will improve safety that is needed in a country where soccer-related crime and violence is common. In addition, Brazil would never have been awarded the World Cup — and the 2016 Olympics in Rio de Janeiro — without a pledge to upgrade crumbling stadiums and tighten security.

The South American country is spending an estimated $3.5 billion on new stadiums and refurbishments, though most of the project has run behind schedule. The need to work 24-7 to finish the venues will run up the costs by millions more. FIFA has complained openly about the delays, acknowledging the Confederations Cup will be a maze of unfinished work.

FIFA Secretary General Jerome Valcke has admitted that “not all operational arrangements will be 100 percent,” then warned “this will be impossible to repeat for the FIFA World Cup.”

The new national stadium in Brasilia opened at a cost of more than $590 million, the most expensive of the 12 World Cup venues. But it has no local team to call it home, and many say it’s a “white elephant.”

It will host the opening of the Confederations Cup on June 15 with Brazil facing Japan.

Another stadium is going up in Manaus in the northern state of Amazonas — again with no local team. It’s the same in the southwestern city of Cuiaba, also without a team in Brazil’s top league.

Brazilian Sports Minister Aldo Rebelo — a Brazilian Communist Party member — defends the stadiums as “centers for sports and nonsports events,” and suggested they would be good places for businesses to hold conventions, shows and fairs.

Omena de Melo countered that the “gentrification” eliminates the diversity.

“Football in Brazil has been a kind of antenna that captures all the different values in Brazilian culture and correlates them into one,” Omena de Melo said. “This sort of informality has existed for a century in these stadiums.”

He used the example of Maracana to show how prices have soared.

The stadium has been closed twice for refurbishment since in the last decade. When it was closed in 2005 to be redone for the 2007 Pan American Games, Omena de Melo’s research showed the cheapest ticket was about $1.50.

In 2010, when it was closed again to be refurbished for next year’s World Cup, the cheapest ticket was about $20.

The Maracana was opened again a few weeks ago. Its capacity has been reduced to just under 79,000 — it held more than 170,000 for the final match of the 1950 World Cup — and plans call for it to be eventually shared by Brazilian clubs Flamengo and Fluminense.

In a country where the official minimum monthly salary is $339, the cheapest ticket for the Brazil-England match will be about $45 — 30 times the price of the cheapest ticket only eight years ago and out of reach for most Cariocas, the term for residents of Rio.

Rio de Janeiro sports journalist Telmo Zanini defended the rising prices and said adjusting to the seating changes will be easy in Rio and Sao Paulo in the prosperous southeast, but more difficult in provincial cities.

He cited a recent case in the city of Belo Horizonte “where people took seats and didn’t want to give them up when the ticketholders arrived. So police or stewards had to be called in.”

He said ticket prices had been rising for a long time, and declined to blame the World Cup. Rio de Janeiro and Sao Paulo are two of the world’s most expensive cities. A kilogram (2.2 pounds) of tomatoes recently sold for $6.50 at some Rio de Janeiro supermarkets, where a standard can of shaving cream costs $12. Shaving gel goes for $15.

“Poor people also can’t buy tickets in England or the United States,” Zanini said. “It’s a question of the market. You don’t see poor people buying tickets for Los Angeles Lakers games. The World Cup is not the only reason. Ticket prices have been going up for a long time. But with the World Cup stadiums we will have better quality stadiums. Some people have not gone to games previously because they did not feel safe.”

Marcello Campos, a 29-year-old fan of Rio club Flamengo who goes to at least one match a week, called the changes “a little difficult.”

“It’s going to be a challenge for the people who are used to the low prices; people who don’t have money to buy a ticket for 80 reals ($40) or 100 reals ($50). It’s expensive now.”

He said getting people to stay in numbered seats would be even tougher.

“It’s impossible for me to watch a football game sitting,” Campos said. “I’m too nervous to be sitting. I’ll need to fix that in my mind, to concentrate on sitting.”

He said the changes would be beneficial, imposing organization on chaos.

“We need to change the culture. It kind of gives everyone equal rights, not just those who show up first.”

Benefiting from many of the changes is a multinational consortium that won a contract in May from the state of Rio de Janeiro to run Maracana for 35 years. The consortium is made up of Brazilian construction conglomerate Odebrecht, Los Angeles-based Sports and entertainment company AEG, and the sport and entertainment company IMX, which is owned by Brazilian billionaire Eike Batista.

Critics say the deal gives the Rio de Janeiro state government less money than it invested in the venue and will lead to the demolition of an indigenous museum, a public school and some athletics facilities in the area. A public prosecutor estimated that $615 million in public money has been spent on Maracana since 2005, raising questions why a private consortium should reap most of the profits from taxpayer money.

The Brazilian soccer great Pele has come out against the privatization, saying the famous stadium “must be of the people, for the Brazilian people.” Others have also questioned selling off what has been traditionally a public space to private interests.

Omena de Melo cautioned that the new stadiums will not eliminate soccer-related violence.

“Violence tied to football could still be there, even after the gentrification,” he said. “If people can’t get inside the stadiums, they are going to get violent outside. You can’t isolate the stadium from the society where it exists. Brazilian society has a lot of problems caused by inequality, and violence is one of them.”

A mulher que encolheu o cérebro humano (O Globo)

Suzana Herculano é a primeira brasileira a falar na prestigiada conferência TED

Ela debaterá o cérebro de 86 bilhões de neurônios (e não 100 bilhões, como se acreditava) e como o homem se diferenciou dos primatas 

Publicado:24/05/13 – 7h00; Atualizado:24/05/13 – 11h41

Suzana Herculano-Houzel, professora do Instituto de Ciências Biomédicas da UFRJFoto: Guito Moreto

Suzana Herculano-Houzel, professora do Instituto de Ciências Biomédicas da UFRJ Guito Moreto

Neurocientista da UFRJ, Suzana Herculano-Houzel é a primeira brasileira a participar da TED (Tecnologia, Entretenimento e Design, em português) — prestigiada série de conferências que reúne grandes nomes das mais diversas áreas do conhecimento para debater novas ideias. Suzana falará no dia 12 de junho, sob o tema “Ouça a natureza”, e destacará suas descobertas únicas sobre o cérebro humano.

Sobre o que vai falar na TED?

Vou falar sobre o cérebro humano e mostrar como ele não é um cérebro especial, uma exceção à regra. Nossas pesquisas nos revelaram que se trata apenas de um cérebro de primata grande. O notável é que passamos a ter um cérebro enorme, do tamanho que nenhum outro primata tem, nem os maiores, porque inventamos o cozimento dos alimentos e, com isso, passamos a ter um número enorme de neurônios.

O cozimento foi fundamental para nos tornarmos humanos?

Sim, burlamos a limitação energética imposta pela dieta crua. E a implicação bacana e irônica é que, com isso, conseguimos liberar tempo no cérebro para nos dedicarmos a outras coisas (que não buscar alimentos), como criar a agricultura, as civilizações, a geladeira e a eletricidade. Até o ponto em que conseguir comida cozida e calorias em excesso ficou tão fácil que, agora, temos o problema inverso: estamos comendo demais. Por isso, voltamos à saladinha.

Se alimentarmos orangotangos e gorilas com comida cozida eles serão tão inteligentes quanto nós?

Sim, porque não seriam limitados pelo número reduzido de calorias que conseguem com a comida crua. Claro que nós fizemos uma inovação cultural ao inventar a cozinha. Tem uma diferença entre dar comida cozida para o animal e ele ter o desenvolvimento cultural do cozimento. Mas, ainda assim, se em todas as refeições eles tiverem acesso à comida cozida, daqui a 200 mil ou 300 mil anos eles terão o cérebro maior. Com a alimentação que têm hoje, não é possível terem um cérebro maior dado o corpo grande que têm. É uma coisa ou outra.

Somos especiais?

A gente não é especial coisa alguma. Somos apenas um primata que burlou as regras energéticas e conseguiu botar mais neurônios no cérebro de um jeito que nenhum outro animal conseguiu. Por isso estudamos os outros animais e não o contrário.

Persistem ainda mitos sobre o cérebro? Como o dos 100 bilhões de neurônios, que seus estudos demonstraram que são, na verdade, 86 bilhões?

Sim, eles continuam existindo, mesmo na neurociência. O nosso trabalho já é muito citado como referência. As coisas estão mudando. E o mais legal é que é por conta da ciência tupiniquim, o que eu acho maravilhoso. Mas vemos que é um processo, que ainda tem muita gente que insiste no número antigo.

O novo manual de diagnóstico de doenças mentais dos EUA (que serve de referência para todo o mundo, inclusive para a OMS) foi lançado na semana passada em meio à controvérsia. Especialistas acham que são tantos transtornos que praticamente não resta mais nenhum espaço para a normalidade. Qual a sua opinião?

Acho que essa discussão é muito necessária, justamente para reconhecermos o que são as variações ao redor do normal e quais são os extremos problemáticos e doentios de fato. Então, a discussão é importante, ótima a qualquer momento. Mas acho também que há muita informação errada e sensacionalista circulando, sobretudo sobre o déficit de atenção. As estatísticas variam muito de país para país, às vezes porque varia o número de médicos que reconhece a criança como portadora do distúrbio. E acho que ainda há um problema enorme, um medo enorme do estereótipo da doença mental. Até hoje ainda existe uma resistência louca em ir a um psiquiatra. E acho que, pelo contrário, ganhamos muito reconhecendo que existem transtornos e que eles podem ser tratados.

Ainda há muito estigma?

O maior problema hoje em dia é que é feio ter um distúrbio no cérebro. Perceba que nem estou falando em transtorno mental. Precisar de remédio para o cérebro é terrível. E temos tanto a ganhar reconhecendo os problemas, fazendo os diagnósticos. O cérebro é tão complexo, tem tanta coisa para dar errado, que o espantoso é que não dê problema em todo mundo sempre. Então, acho normal que boa parte da população tenha algum problema, não me espanta nem um pouco. E, uma vez que se reconhece o problema, que se faz o diagnóstico, há a opção de poder tratar. Se dispomos de um tratamento, por que não usar?

O presidente dos EUA, Barack Obama, recentemente anunciou uma inédita iniciativa de reunir pesquisadores dos mais diversos centros para estudar exclusivamente o cérebro. O que podemos esperar de tamanho esforço científico?

Não só o cérebro, mas o cérebro em atividade. Obama quer ir além do que já tinham feito — estudar a função de diferentes áreas — e entender como se conectam, como falam umas com as outras, ter ideia desse funcionamento integrado, dessa interação. Essa é uma das grandes lacunas do conhecimento: entender como as várias partes do cérebro funcionam ao mesmo tempo. Não sabemos como o cérebro funciona como um todo; é uma das fronteiras finais do conhecimento.

Não sabemos como o cérebro funciona?

Como um todo, não. Sabemos o que as partes fazem, mas não sabemos como se dá a conversa entre elas. Não sabemos a origem da consciência, da sensação do “eu estou aqui agora”. Que áreas são fundamentais para isso? É esse tipo de conhecimento que se está buscando, do cérebro funcionando ao vivo e em cores, em tempo real.

O objetivo não é estudar doenças, então?

Não, o grande objetivo é estudar consciência, memória; entender como o cérebro reúne emoção e lógica, coisas que são fruto da ação coordenada de várias partes. Claro que desse conhecimento todo podem surgir implicações para o Alzheimer e outras doenças. Mas, na verdade, falar em doenças é uma roupagem usada pela divulgação do programa para o público assimilar melhor. Existe esse preconceito de que a ciência só vale quando resolve uma doença.

Leia mais sobre esse assunto em http://oglobo.globo.com/ciencia/a-mulher-que-encolheu-cerebro-humano-8482825#ixzz2UFWUvdYn © 1996 – 2013. Todos direitos reservados a Infoglobo Comunicação e Participações S.A. Este material não pode ser publicado, transmitido por broadcast, reescrito ou redistribuído sem autorização.

Ants and Carnivorous Plants Conspire for Mutualistic Feeding (Science Daily)

May 22, 2013 — An insect-eating pitcher plant teams up with ants to prevent mosquito larvae from stealing its nutrients, according to research published May 22 in the open access journal PLOS ONE by Mathias Scharmann and colleagues from the University of Cambridge and the University Brunei Darussalam.

The carnivorous pitcher plant Nepenthes bicalcarata (A) and the ant Camponotus schmitzi (B) team up to fight fly larvae (C) that steal the plant’s prey. (Credit: Scharmann M, Thornham DG, Grafe TU, Federle W (2013) A Novel Type of Nutritional Ant–Plant Interaction: Ant Partners of Carnivorous Pitcher Plants Prevent Nutrient Export by Dipteran Pitcher Infauna. PLoS ONE 8(5): e63556. doi:10.1371/journal.pone.0063556)

The unusual relationship between insect-eating pitcher plants and ants that live exclusively on them has long puzzled scientists. The Camponotus schmitzi ants live only on one species of Bornean pitcher plants (Nepenthes bicalcarata), where they walk across slippery pitcher traps, swim and dive in the plant’s digestive fluids and consume nectar and prey that fall into the trap. Though the benefits to the ants are obvious, it has been harder to tell what exactly the plants gain. However, plants that harbor the insects grow larger than those that do not, suggesting a mutualistic relationship exists between the two.

In this new study, researchers demonstrated a flow of nutrients from ants to their plant hosts, and found that plants colonized by insects received more nitrogen than those that did not host ants. Ants appeared to increase the pitchers’ capture efficiency by keeping traps clean, and also protected the plants by actively hunting mosquito larvae that otherwise bred in pitcher fluids and sucked up plant nutrients.

“Kneeling down in the swamp amidst huge pitcher plants in a Bornean rainforest, it was a truly jaw-dropping experience when we first noticed how very aggressive and skilled theCamponotus schmitzi ants were in underwater hunting: it was a mosquito massacre!” says Scharmann. “Later, when we discovered that the ants’ droppings are returned to the plant, it became clear that this unique behaviour could actually play an important role in the complex relationship of the pitcher plant with the ants.”

Based on these observations, the authors suggest that nutrients the pitchers would have otherwise lost to flies are instead returned to them as ant colony wastes. They conclude that the interaction between ants, pitcher plants and mosquito larvae in the pitcher represents a new type of mutualism, where animals can help mitigate the damage caused by nutrient thieves to a plant.

Journal Reference:

  1. Mathias Scharmann, Daniel G. Thornham, T. Ulmar Grafe, Walter Federle. A Novel Type of Nutritional Ant–Plant Interaction: Ant Partners of Carnivorous Pitcher Plants Prevent Nutrient Export by Dipteran Pitcher Infauna.PLoS ONE, 2013; 8 (5): e63556 DOI:10.1371/journal.pone.0063556

Depression Linked to Telomere Enzyme, Aging, Chronic Disease (Science Daily)

May 23, 2013 — The first symptoms of major depression may be behavioral, but the common mental illness is based in biology — and not limited to the brain. In recent years some studies have linked major, long-term depression with life-threatening chronic disease and with earlier death, even after lifestyle risk factors have been taken into account.

The first symptoms of major depression may be behavioral, but the common mental illness is based in biology — and not limited to the brain. In recent years some studies have linked major, long-term depression with life-threatening chronic disease and with earlier death, even after lifestyle risk factors have been taken into account. (Credit: © diego cervo / Fotolia)

Now a research team led by Owen Wolkowitz, MD, professor of psychiatry at UC San Francisco, has found that within cells of the immune system, activity of an enzyme called telomerase is greater, on average, in untreated individuals with major depression. The preliminary findings from his latest, ongoing study will be reported today at the annual meeting of the American Psychiatric Association in San Francisco.

Telomerase is an enzyme that lengthens protective end caps on the chromosomes’ DNA, called telomeres. Shortened telomeres have been associated with earlier death and with chronic diseases in population studies.

The heightened telomerase activity in untreated major depression might represent the body’s attempt to fight back against the progression of disease, in order to prevent biological damage in long-depressed individuals, Wolkowitz said.

The researchers made another discovery that may suggest a protective role for telomerase. Using magnetic resonance imaging (MRI), they found that, in untreated, depressed study participants, the size of the hippocampus, a brain structure that is critical for learning and memory, was associated with the amount of telomerase activity measured in the white blood cells. Such an association at a single point in time cannot be used to conclude that there is a cause-and-effect relationship with telomerase helping to protect the hippocampus, but it is plausible, Wolkowitz said.

Remarkably, the researchers also found that the enzyme’s activity went up when some patients began taking an antidepressant. In fact, depressed participants with lower telomerase activity at baseline — as well as those in whom enzyme activity increased the most with treatment — were the most likely to become less depressed with treatment.

“Our results are consistent with the beneficial effect of telomerase when it is boosted in animal studies, where it has been associated with the growth of new nerve cells in the hippocampus and with antidepressant-like effects, evidenced by increased exploratory behavior,” Wolkowitz said. Wolkowitz cautions that his new findings are preliminary due to the small size of the study and must be confirmed through further research.

The researchers also measured telomere length in the same immune cells. Only very chronically depressed individuals showed telomere shortening, Wolkowitz said.

“The longer people had been depressed, the shorter their telomeres were,” he said. “Shortened telomere length has been previously demonstrated in major depression in most, but not all, studies that have examined it. The duration of depression may be a critical factor.”

The 20 depressed participants enrolled in the study had been untreated for at least six weeks and had an average lifetime duration of depression of about 13 years. After baseline evaluation and laboratory measures, 16 of the depressed participants were treated with sertraline, a member of the most popular class of anti-depressants, the serotonin-selective-reuptake-inhibitors (SSRIs), and then evaluated again after eight weeks. There were 20 healthy participants who served as controls.

The ongoing study still is accepting depressed participants who are not now taking antidepressants. Wolkowitz’s team also studies chronic inflammation and the biochemical phenomenon of oxidative stress, which he said have often been reported in major depression. Wolkowitz is exploring the hypothesis that inflammation and oxidative stress play a role in telomere shortening and accelerated aging in depression.

“New insights into the mechanisms of these processes may well lead to new treatments — both pharmacological and behavioral — that will be distinctly different from the current generation of drugs prescribed to treat depression,” he said. “Additional studies might lead to simple blood tests that can measure accelerated immune-cell aging.”

Wolkowitz’s research is funded by the National Institutes of Health. He is on the scientific advisory board of Telome Health, Inc., a private biotechnology company.

Story Source:

The above story is reprinted from materials provided byUniversity of California, San Francisco (UCSF). The original article was written by Jeffrey Norris.

Luta contra o racismo no Brasil passa por salão de beleza (Agence France-Presse/Yahoo News)

Por Por Laura BONILLA CAL | AFP – 23/05/2013

A rede se dedica aos cabelos no estilo afro

A rede se dedica aos cabelos no estilo afro

A presidente da empresa, Leila Velez

A presidente da empresa, Leila Velez

Nada como um bom penteado para combater o racismo arraigado na sociedade brasileira, usando como armas principais tesouras e hidratantes para o cabelo.

Na periferia do Rio de Janeiro, uma rede de salões de beleza que se dedica a atender a negras e mulatas majoritariamente da classe C faz um grande sucesso.

Qual é a fórmula do êxito desta empresa que transforma o “afro” em cachos suaves, e que nega categoricamente a crença popular de que o cabelo crespo é ruim? O crescimento econômico do Brasil, que na última década permitiu que 40 milhões de brasileiros integrassem a classe média por meio de programas sociais do governo.

Dos 194 milhões de brasileiros, 50,7% são negros ou mulatos, e os donos do Beleza Natural, esta peculiar rede de salões de beleza, estimam que 70% das mulheres brasileiras têm cabelo crespo.

“Você é linda porque é negra”

“Este salão é para a consumidora esquecida, invisível, para levantar a autoestima da cliente de baixa renda. Uma mulher acostumada a servir, que merece ser servida, e bem servida”, explica à AFP a presidente da empresa, Leila Velez, uma mulata de 38 anos que aos 16 era gerente de um McDonald’s no Rio.

Velez criou com dificuldades o Beleza Natural há 20 anos junto com familiares. Hoje dirige as 13 filiais da empresa e uma fábrica de produtos para os cabelos, que conta com 1.700 funcionários.

A fábrica produz 250 toneladas de produtos de uso capilar por mês, incluindo o “super relaxante” de cachos criado por sua cunhada Zica Assis, uma ex-empregada doméstica que fez experimentos durante dez anos com frutas, como o açaí, até chegar à fórmula do produto na varanda de sua casa, em uma favela.

Os lucros da rede, que tem salões localizados da periferia a áreas nobres da cidade, cresceram 30% anualmente nos últimos oito anos, segundo Velez, que não revela os resultados da empresa.

Seu sucesso é tamanho que caravanas com centenas de mulheres vindas de outros estados chegam a cada fim de semana para que as viajantes sejam atendidas nos salões.

“Acredito que 100% de seu sucesso esteja ligado à questão da raça. Existem no Brasil, devido a uma carga cultural, muitas mulheres negras que não aceitam seu cabelo porque não é liso, que é o ideal de beleza mais conhecido”, explicou à AFP Victor Cunha da Almeida, professor da escola de negócios da Universidade Federal do Rio de Janeiro e coautor de uma tese sobre o “Beleza” e sua aposta na “base da pirâmide” social, a classe C, que chega a 54% da população.

“Aí está a diferença do Beleza Natural, que não quer alisar o seu cabelo, quer domá-lo, suavizar os cachos. Diz a mulher: ‘você é linda porque é negra, é linda porque tem os cabelos assim'”.

Bruna Mara, uma cliente, confirma. “Sempre usava o cabelo liso; aqui me convenceram de que meus cachos poderiam ficar bonitos, e é mais natural”, confessa esta secretaria de 24 anos.

Princesas

“Não havia locais onde uma mulher negra com cabelo crespo fosse tratada como princesa”, ressalta o professor Cunha.

Quando alguém entra no mundo do Beleza Natural, decorado em vermelho e rosa, cheio de espelhos e focos luminosos, com flores frescas e café, sente-se em qualquer bairro rico do mundo, ou em um cenário de novela.

“Temos espelhos de corpo inteiro, porque muitas clientes não têm isso em suas casas”, explica Velez.

José Jorge de Carvalho, antropólogo especialista em questões raciais da Universidade de Brasília, ressalta que, apesar de ser visto no exterior como um exemplo de diversidade, o Brasil “é um país muito racista”.

“Estes salões de beleza fazem parte de um esforço de combate ao racismo, para melhorar a auto-estima das mulheres negras de classes popular”, afirma Carvalho, que lamenta o elevado uso no Brasil de pranchas para alisar o cabelo, algumas delas esquentadas diretamente no fogo e que “fritam o cabelo”.

Uma nova classe média

Atualmente, a rede de salões atende 90.000 mulheres por mês.

“Esta é a nova classe média, produzindo para a nova classe média”, comemora Marcelo Neri, ministro interino de Assuntos Estratégicos, em declarações à AFP.

As rendas das populações negra e parda brasileira foram as que mais cresceram

entre 2001 e 2009, 43% e 48% respectivamente, contra 21% para os brancos, segundo Neri, especialista na classe média brasileira.

No entanto, as desigualdades ainda são enormes: 125 anos depois da abolição da escravatura, os brancos no Brasil recebem em média quase o dobro do que os negros.

Ser atendido no “Beleza” é acessível, mas não barato. Custa em média 80 reais (10% do salário mínimo), e para mantê-lo em casa são necessários produtos que custam 50 reais mensais.

Apesar disso, a maioria paga em dinheiro, outro sinal do aumento real de poder aquisitivo da nova classe média brasileira.

Geoengineering: Can We Save the Planet by Messing with Nature? (Democracy Now!)

Video: http://www.democracynow.org/2013/5/20/geoengineering_can_we_save_the_planet

Clive Hamilton, professor of public ethics at Charles Sturt University in Canberra, Australia. He is the author of the new book, Earthmasters: The Dawn of the Age of Climate Engineering.

Overheated rhetoric on climate change doesn’t make for good policies (Washington Post)

By Lamar Smith, Published: May 19, 2013

Lamar Smith, a Republican, represents Texas’s 21st District in the U.S. House and is chairman of the House Committee on Science, Space and Technology.

Climate change is an issue that needs to be discussed thoughtfully and objectively. Unfortunately, claims that distort the facts hinder the legitimate evaluation of policy options. The rhetoric has driven some policymakers toward costly regulations and policies that will harm hardworking American families and do little to decrease global carbon emissions. The Obama administration’s decision to delay, and possibly deny, the Keystone XL pipeline is a prime example.

The State Department has found that the pipeline will have minimal impact on the surrounding environment and no significant effect on the climate. Recent expert testimony before the House Committee on Science, Space and Technology confirms this finding. In fact, even if the pipeline is approved and is used at maximum capacity, the resulting increase in carbon dioxide emissions would be a mere 12 one-thousandths of 1 percent (0.012 percent). There is scant scientific or environmental justification for refusing to approve the pipeline, a project that the State Department has also found would generate more than 40,000 U.S. jobs.

Contrary to the claims of those who want to strictly regulate carbon dioxide emissions and increase the cost of energy for all Americans, there is a great amount of uncertainty associated with climate science. These uncertainties undermine our ability to accurately determine how carbon dioxide has affected the climate in the past. They also limit our understanding of how anthropogenic emissions will affect future warming trends. Further confusing the policy debate, the models that scientists have come to rely on to make climate predictions have greatly overestimated warming. Contrary to model predictions, data released in October from the University of East Anglia’s Climate Research Unit show that global temperatures have held steady over the past 15 years, despite rising greenhouse gas emissions.

Among the facts that are clear, however, are that U.S. emissions contribute very little to global concentrations of greenhouse gas, and that even substantial cuts in these emissions are likely to have no effect on temperature. Data from the Energy Information Administration show, for example, that the United States cut carbon dioxide emissions by 12 percent between 2005 and 2012 while global emissions increased by 15 percent over the same period.

Using data from the Intergovernmental Panel on Climate Change (IPCC), a Science and Public Policy Institute paper published last month found that if the United States eliminated all carbon dioxide emissions, the overall impact on global temperature rise would be only 0.08 degrees Celsius by 2050.

Further confounding the debate are unscientific and often hyperbolic claims about the potential effects of a warmer world. In his most recent State of the Union address, President Obama said that extreme weather events have become “more frequent and intense,” and he linked Superstorm Sandy to climate change.

But experts at the National Oceanic and Atmospheric Administration have told the New York Times that climate change had nothing to do with Superstorm Sandy. This is underscored by last year’s IPCC report stating that there is “high agreement” among leading experts that trends in weather disasters, floods, tornados and storms cannot be attributed to climate change. While these claims may make for good political theater, their effect on recent public policy choices hurts the economy.

Last spring the Environmental Protection Agency proposed emissions standards that virtually prohibit new coal-fired power plants. As we await implementation of these strict new rules, additional regulations that will affect existing power plants, refineries and other manufactures are sure to follow. Analyses of these measures by the American Council for Capital Formation, which studies economic and environmental policy, show that they will raise both electricity rates and gas prices — costing jobs and hurting the economy — even as the EPA admits that these choices will have an insignificant impact on global climate change (a point former EPA administrator Lisa Jackson confessed during a Senate hearing in 2009).

Instead of pursuing heavy-handed regulations that imperil U.S. jobs and send jobs (and their emissions) overseas, we should take a step back from the unfounded claims of impending catastrophe and think critically about the challenge before us. Designing an appropriate public policy response to this challenge will require that we fully assess the facts and the uncertainties surrounding this issue, and that we set aside the hyped rhetoric.

Read more from PostOpinions: Greg Sargent: Now can we talk about climate change? The Post’s View: Carbon tax is best option Congress has Matthew Stepp: The limits of renewable energy Stephen Stromberg: In State of the Union, Obama threatens Congress on climate change. And that’s a good thing.

‘Boys Will Be Boys’ in U.S., but Not in Asia (Science Daily)

May 22, 2013 — A new study shows there is a gender gap when it comes to behavior and self-control in American young children — one that does not appear to exist in children in Asia. 

Boys will be boys. A new study shows there is a gender gap when it comes to behavior and self-control in American young children — one that does not appear to exist in children in Asia. (Credit: © Vesna Cvorovic / Fotolia)

In the United States, girls had higher levels of self-regulation than boys. Self-regulation is defined as children’s ability to control their behavior and impulses, follow directions, and persist on a task. It has been linked to academic performance and college completion, in past studies by Oregon State University researchers.

In three Asian countries, the gender gap in the United States was not found when researchers directly assessed the self-regulation of 3-6 year olds. The results appear in the new issue of the journal Early Childhood Research Quarterly.

“These findings suggest that although we often expect girls to be more self-regulated than boys, this may not be the case for Asian children,” said Shannon Wanless, lead author of the study.

Wanless began conducting the research during her doctoral studies at Oregon State University under Megan McClelland, an associate professor in OSU’s Hallie E. Ford Center for Healthy Children and Families. Wanless is now on the faculty at the University of Pittsburgh.

One interesting part of the researcher’s findings: Although there were no gender differences in self-regulation when the children were directly assessed using a variety of school-readiness tasks, teachers in Asia perceived girls as performing better on self-regulation even when they actually performed equally to boys.

“Teachers are rating children’s behavior in the classroom environment, which has a lot of distractions and is very stimulating,” Wanless said. “It is possible that boys in the Asian countries were able to self-regulate as well as girls when they were in a quiet space (the direct assessment), but were not able to regulate themselves as well in a bustling classroom environment (teacher ratings).”

In addition, McClelland said cultural expectations of girls’ behavior versus that of their male peers may be influencing teachers’ assessments.

“In general, there is more tolerance for active play in boys than in girls,” McClelland said. “Girls are expected to be quiet and not make a fuss. This expectation may be coloring some teachers’ perceptions.”

The researchers conducted assessments with 814 children in the United States, Taiwan, South Korea and China. Their study showed that U.S. girls had significantly higher self-regulation than boys, but there were no significant gender differences in any Asian societies. In addition, for both genders, directly assessed and teacher-rated self-regulation were related to many aspects of school readiness in all societies for girls and boys.

“We know from previous research that many Asian children outperform American children in academic achievement,” McClelland said. “Increasingly, we are seeing that there is also a gap when it comes to their ability to control their behavior and persist with tasks.”

Wanless said this study paves the way for future research to explore why there is such a large gender gap in the United States, and what can be learned from Asian schools.

“What can we learn from Asian cultural and teaching practices about how we can support girls and boys to be successful in school?” she said. “When we see differences in developmental patterns across countries it suggests that we might want to look at teaching and parenting practices in those countries and think about how they might apply in the United States.”

Both researchers emphasized the importance of working with young children, regardless of gender or culture, on their self-regulation skills. Practicing games such as Simon Says and Red Light, Green Light are a few ways that parents can work with their children to help them learn how to follow instructions, persist on a task, and listen carefully.

“In our study, self-regulation was good for academic achievement for boys and girls,” Wanless said. “That means this skill is important for both genders and we should be supporting self-regulatory development for all children, especially boys. Low self-regulation in preschool has been linked to difficulties in adulthood, so increased focused on supporting young boys’ development can have long-term positive benefits.”

Journal Reference:

  1. Shannon B. Wanless, Megan M. McClelland, Xuezhao Lan, Seung-Hee Son, Claire E. Cameron, Frederick J. Morrison, Fu-Mei Chen, Jo-Lin Chen, Su Li, Kangyi Lee, Miyoung Sung. Gender differences in behavioral regulation in four societies: The United States, Taiwan, South Korea, and ChinaEarly Childhood Research Quarterly, 2013; 28 (3): 621 DOI: 10.1016/j.ecresq.2013.04.002

Oldest Evidence of Split Between Old World Monkeys and Apes: Primate Fossils Are 25 Million Years Old (Science Daily)

May 15, 2013 — Two fossil discoveries from the East African Rift reveal new information about the evolution of primates, according to a study published online in Nature this week led by Ohio University scientists. 

Artist’s reconstruction of Rukwapithecus (front, center) and Nsungwepithecus (right). (Credit: Mauricio Anton)

The team’s findings document the oldest fossils of two major groups of primates: the group that today includes apes and humans (hominoids), and the group that includes Old World monkeys such as baboons and macaques (cercopithecoids).

Geological analyses of the study site indicate that the finds are 25 million years old, significantly older than fossils previously documented for either of the two groups.

Both primates are new to science, and were collected from a single fossil site in the Rukwa Rift Basin of Tanzania.Rukwapithecus fleaglei is an early hominoid represented by a mandible preserving several teeth. Nsungwepithecus gunnelli is an early cercopithecoid represented by a tooth and jaw fragment.

The primates lived during the Oligocene epoch, which lasted from 34 to 23 million years ago. For the first time, the study documents that the two lineages were already evolving separately during this geological period.

“The late Oligocene is among the least sampled intervals in primate evolutionary history, and the Rukwa field area provides a first glimpse of the animals that were alive at that time from Africa south of the equator,” said Nancy Stevens, an associate professor of paleontology in Ohio University’s Heritage College of Osteopathic Medicine who leads the paleontological team.

Documenting the early evolutionary history of these groups has been elusive, as there are few fossil-bearing deposits of the appropriate age, Stevens explained. Using an approach that dated multiple minerals contained within the rocks, team geologists could determine a precise age for the specimens.

“The rift setting provides an advantage in that it preserves datable materials together with these important primate fossils,” said lead geologist Eric Roberts of James Cook University in Australia.

Prior to these finds, the oldest fossil representatives of the hominoid and cercopithecoid lineages were recorded from the early Miocene, at sites dating millions of years younger.

The new discoveries are particularly important for helping to reconcile a long-standing disagreement between divergence time estimates derived from analyses of DNA sequences from living primates and those suggested by the primate fossil record, Stevens said. Studies of clock-like mutations in primate DNA have indicated that the split between apes and Old

World monkeys occurred between 30 million and 25 million years ago.

“Fossils from the Rukwa Rift Basin in southwestern Tanzania provide the first real test of the hypothesis that these groups diverged so early, by revealing a novel glimpse into this late Oligocene terrestrial ecosystem,” Stevens said.

The new fossils are the first primate discoveries from this precise location within the Rukwa deposits, and two of only a handful of known primate species from the entire late Oligocene, globally.

The scientists scanned the specimens in the Ohio University’s MicroCT scanner, allowing them to create detailed 3-dimensional reconstructions of the ancient specimens that were used for comparisons with other fossils.

“This is another great example that underscores how modern imaging and computational approaches allow us to address more refined questions about vertebrate evolutionary history,” said Patrick O’Connor, co-author and professor of anatomy in Ohio University’s Heritage College of Osteopathic Medicine.

In addition to the new primates, Rukwa field sites have produced several other fossil vertebrate and invertebrate species new to science. The late Oligocene interval is interesting because it provides a final snapshot of the unique species inhabiting Africa prior to large-scale faunal exchange with Eurasia that occurred later in the Cenozoic Era, Stevens said.

A key aspect of the Rukwa Rift Basin project is the interdisciplinary nature of the research team, with paleontologists and geologists working together to reconstruct vertebrate evolutionary history in the context of the developing East African Rift System.

“Since its inception this project has employed a multifaceted approach for addressing a series of large-scale biological and geological questions centered on the East African Rift System in Tanzania,” O’Connor said.

The team’s research, funded by the U.S. National Science Foundation, the Leakey Foundation and the National Geographic Society, underscores the integration of paleontological and geological approaches that are essential for addressing complex issues in vertebrate evolutionary history, the scientists noted.

Co-authors on the study are Patrick O’Connor, Cornelia Krause and Eric Gorscak of Ohio University, Erik Seiffert of SUNY Stony Brook University, Eric Roberts of James Cook University in Australia, Mark Schmitz of Boise State University, Sifa Ngasala of Michigan State University, Tobin Hieronymus of Northeast Ohio Medical University and Joseph Temu of the Tanzania Antiquities Unit.

Journal Reference:

  1. Nancy J. Stevens, Erik R. Seiffert, Patrick M. O’Connor, Eric M. Roberts, Mark D. Schmitz, Cornelia Krause, Eric Gorscak, Sifa Ngasala, Tobin L. Hieronymus, Joseph Temu.Palaeontological evidence for an Oligocene divergence between Old World monkeys and apes.Nature, 2013; DOI: 10.1038/nature12161

No Idle Chatter: Malaria Parasites ‘Talk’ to Each Other (Science Daily)

May 15, 2013 — Melbourne scientists have made the surprise discovery that malaria parasites can ‘talk’ to each other — a social behaviour to ensure the parasite’s survival and improve its chances of being transmitted to other humans.

Professor Alan Cowman (left) and Dr Neta Regev-Rudzki have made the surprise discovery that malaria parasites can ‘talk’ to each other. This social behaviour ensures the parasite’s survival and improves its chances of being transmitted to other humans. (Credit: Image courtesy of Walter and Eliza Hall Institute)

The finding could provide a niche for developing antimalarial drugs and vaccines that prevent or treat the disease by cutting these communication networks.

Professor Alan Cowman, Dr Neta Regev-Rudzki, Dr Danny Wilson and colleagues from the Walter and Eliza Hall Institute’s Infection and Immunity division, in collaboration with Professor Andrew Hill from the University of Melbourne’s Bio21 Institute and Department of Biochemistry and Molecular Biology showed that malaria parasites are able to send out messages to communicate with other malaria parasites in the body. The study was published today in the journal Cell.

Professor Cowman said the researchers were shocked to discover that malaria parasites work in unison to enhance ‘activation’ into sexually mature forms that can be picked up by mosquitoes, which are the carriers of this deadly disease.

“When Neta showed me the data, I was absolutely amazed, I couldn’t believe it,” Professor Cowman said. “We repeated the experiments many times in many different ways before I really started to believe that these parasites were signalling to each other and communicating. But we came to appreciate why the malaria parasite really needs this mechanism — it needs to know how many other parasites are in the human to sense when is the right time to activate into sexual forms that give it the best chance of being transmitted back to the mosquito.”

Malaria kills about 700,000 people a year, mostly children aged under five and pregnant women. Every year, hundreds of millions of people are infected with the malaria parasite,Plasmodium, which is transmitted through mosquito bites. It is estimated that half the world’s population is at risk of contracting malaria, with the disease being concentrated in tropical and subtropical regions including many of Australia’s near neighbours.

Dr Regev-Rudzki said the malaria parasites inside red blood cells communicate by sending packages of DNA to each other during the blood stage of infection. “We showed that the parasites inside infected red blood cells can send little packets of information from one parasite to another, particularly in response to stress,” she said.

The communication network is a social behaviour that has evolved to signal when the parasites should complete their lifecycle and be transmitted back to a mosquito, Dr Regev-Rudzki said. “Once they receive this information, they change their fate — the signals tell the parasites to become sexual forms, which are the forms of the malaria parasite that can live and replicate in the mosquito, ensuring the parasites survives and is transmitted to another human.”

Professor Cowman said he hopes to see the discovery pave the way to new antimalarial drugs or vaccines for preventing malaria. “This discovery has fundamentally changed our view of the malaria parasite and is a big step in understanding how the malaria parasite survives and is transmitted,” he said. “The next step is to identify the molecules involved in this signalling process, and ways that we could block these communication networks to block the transmission of malaria from the human to the mosquito. That would be the ultimate goal.”

This project was supported by the National Health and Medical Research Council of Australia, Howard Hughes Medical Institute and the Victorian Government.

Journal Reference:

  1. Neta Regev-Rudzki, Danny W. Wilson, Teresa G. Carvalho, Xavier Sisquella, Bradley M. Coleman, Melanie Rug, Dejan Bursac, Fiona Angrisano, Michelle Gee, Andrew F. Hill, Jake Baum, Alan F. Cowman. Cell-Cell Communication between Malaria-Infected Red Blood Cells via Exosome-like VesiclesCell, 2013; DOI:10.1016/j.cell.2013.04.029

Schizophrenia Symptoms Eliminated in Animal Model (Science Daily)

May 22, 2013 — Overexpression of a gene associated with schizophrenia causes classic symptoms of the disorder that are reversed when gene expression returns to normal, scientists report. 

Overexpression of a gene associated with schizophrenia causes classic symptoms of the disorder that are reversed when gene expression returns to normal, scientists report. Pictured are (left to right) Drs. Lin Mei, Dongmin Yin and Yongjun Chen, Medical College of Georgia at Georgia Regents University. (Credit: Phil Jones, Georgia Regents University Photographer)

They genetically engineered mice so they could turn up levels of neuregulin-1 to mimic high levels found in some patients then return levels to normal, said Dr. Lin Mei, Director of the Institute of Molecular Medicine and Genetics at the Medical College of Georgia at Georgia Regents University.

They found that when elevated, mice were hyperactive, couldn’t remember what they had just learned and couldn’t ignore distracting background or white noise. When they returned neuregulin-1 levels to normal in adult mice, the schizophrenia-like symptoms went away, said Mei, corresponding author of the study in the journal Neuron.

While schizophrenia is generally considered a developmental disease that surfaces in early adulthood, Mei and his colleagues found that even when they kept neuregulin-1 levels normal until adulthood, mice still exhibited schizophrenia-like symptoms once higher levels were expressed. Without intervention, they developed symptoms at about the same age humans do.

“This shows that high levels of neuregulin-1 are a cause of schizophrenia, at least in mice, because when you turn them down, the behavior deficit disappears,” Mei said. “Our data certainly suggests that we can treat this cause by bringing down excessive levels of neuregulin-1 or blocking its pathologic effects.”

Schizophrenia is a spectrum disorder with multiple causes — most of which are unknown — that tends to run in families, and high neuregulin-1 levels have been found in only a minority of patients. To reduce neuregulin-1 levels in those individuals likely would require development of small molecules that could, for example, block the gene’s signaling pathways, Mei said. Current therapies treat symptoms and generally focus on reducing the activity of two neurotransmitters since the bottom line is excessive communication between neurons.

The good news is it’s relatively easy to measure neuregulin-1 since blood levels appear to correlate well with brain levels. To genetically alter the mice, they put a copy of the neuregulin-1 gene into mouse DNA then, to make sure they could control the levels, they put in front of the DNA a binding protein for doxycycline, a stable analogue for the antibiotic tetracycline, which is infamous for staining the teeth of fetuses and babies.

The mice are born expressing high levels of neuregulin-1 and giving the antibiotic restores normal levels. “If you don’t feed the mice tetracycline, the neuregulin-1 levels are always high,” said Mei, noting that endogenous levels of the gene are not affected. High-levels of neuregulin-1 appear to activate the kinase LIMK1, impairing release of the neurotransmitter glutamate and normal behavior. The LIMK1 connection identifies another target for intervention, Mei said.

Neuregulin-1 is essential for heart development as well as formation of myelin, the insulation around nerves. It’s among about 100 schizophrenia-associated genes identified through genome-wide association studies and has remained a consistent susceptibility gene using numerous other methods for examining the genetics of the disease. It’s also implicated in cancer.

Mei and his colleagues were the first to show neuregulin-1’s positive impact in the developed brain, reporting in Neuron in 2007 that it and its receptor ErbB4 help maintain a healthy balance of excitement and inhibition by releasing GABA, a major inhibitory neurotransmitter, at the sight of inhibitory synapses, the communication paths between neurons. Years before, they showed the genes were also at excitatory synapses, where they also could quash activation. In 2009, the MCG researchers provided additional evidence of the role of neuregulin-1 in schizophrenia by selectively deleting the gene for its receptor, ErbB4 and creating another symptomatic mouse.

Schizophrenia affects about 1 percent of the population, causing hallucinations, depression and impaired thinking and social behavior. Babies born to mothers who develop a severe infection, such as influenza or pneumonia, during pregnancy have a significantly increased risk of schizophrenia.

Journal Reference:

  1. Dong-Min Yin, Yong-Jun Chen, Yi-Sheng Lu, Jonathan C. Bean, Anupama Sathyamurthy, Chengyong Shen, Xihui Liu, Thiri W. Lin, Clifford A. Smith, Wen-Cheng Xiong, Lin Mei.Reversal of Behavioral Deficits and Synaptic Dysfunction in Mice Overexpressing Neuregulin 1.Neuron, 2013; 78 (4): 644 DOI:10.1016/j.neuron.2013.03.028

Brain Can Be Trained in Compassion, Study Shows (Science Daily)

May 22, 2013 — Until now, little was scientifically known about the human potential to cultivate compassion — the emotional state of caring for people who are suffering in a way that motivates altruistic behavior.

Investigators trained young adults to engage in compassion meditation, an ancient Buddhist technique to increase caring feelings for people who are suffering. (Credit: © byheaven / Fotolia)

A new study by researchers at the Center for Investigating Healthy Minds at the Waisman Center of the University of Wisconsin-Madison shows that adults can be trained to be more compassionate. The report, published Psychological Science, a journal of the Association for Psychological Science, investigates whether training adults in compassion can result in greater altruistic behavior and related changes in neural systems underlying compassion.

“Our fundamental question was, ‘Can compassion be trained and learned in adults? Can we become more caring if we practice that mindset?'” says Helen Weng, lead author of the study and a graduate student in clinical psychology. “Our evidence points to yes.”

In the study, the investigators trained young adults to engage in compassion meditation, an ancient Buddhist technique to increase caring feelings for people who are suffering. In the meditation, participants envisioned a time when someone has suffered and then practiced wishing that his or her suffering was relieved. They repeated phrases to help them focus on compassion such as, “May you be free from suffering. May you have joy and ease.”

Participants practiced with different categories of people, first starting with a loved one, someone whom they easily felt compassion for, like a friend or family member. Then, they practiced compassion for themselves and, then, a stranger. Finally, they practiced compassion for someone they actively had conflict with called the “difficult person,” such as a troublesome coworker or roommate.

“It’s kind of like weight training,” Weng says. “Using this systematic approach, we found that people can actually build up their compassion ‘muscle’ and respond to others’ suffering with care and a desire to help.”

Compassion training was compared to a control group that learned cognitive reappraisal, a technique where people learn to reframe their thoughts to feel less negative. Both groups listened to guided audio instructions over the Internet for 30 minutes per day for two weeks. “We wanted to investigate whether people could begin to change their emotional habits in a relatively short period of time,” says Weng.

The real test of whether compassion could be trained was to see if people would be willing to be more altruistic — even helping people they had never met. The research tested this by asking the participants to play a game in which they were given the opportunity to spend their own money to respond to someone in need (called the “Redistribution Game”). They played the game over the Internet with two anonymous players, the “Dictator” and the “Victim.” They watched as the Dictator shared an unfair amount of money (only $1 out of $10) with the Victim. They then decided how much of their own money to spend (out of $5) in order to equalize the unfair split and redistribute funds from the Dictator to the Victim.

“We found that people trained in compassion were more likely to spend their own money altruistically to help someone who was treated unfairly than those who were trained in cognitive reappraisal,” Weng says.

“We wanted to see what changed inside the brains of people who gave more to someone in need. How are they responding to suffering differently now?” asks Weng. The study measured changes in brain responses using functional magnetic resonance imaging (fMRI) before and after training. In the MRI scanner, participants viewed images depicting human suffering, such as a crying child or a burn victim, and generated feelings of compassion towards the people using their practiced skills. The control group was exposed to the same images, and asked to recast them in a more positive light as in reappraisal.

The researchers measured how much brain activity had changed from the beginning to the end of the training, and found that the people who were the most altruistic after compassion training were the ones who showed the most brain changes when viewing human suffering. They found that activity was increased in the inferior parietal cortex, a region involved in empathy and understanding others. Compassion training also increased activity in the dorsolateral prefrontal cortex and the extent to which it communicated with the nucleus accumbens, brain regions involved in emotion regulation and positive emotions.

“People seem to become more sensitive to other people’s suffering, but this is challenging emotionally. They learn to regulate their emotions so that they approach people’s suffering with caring and wanting to help rather than turning away,” explains Weng.

Compassion, like physical and academic skills, appears to be something that is not fixed, but rather can be enhanced with training and practice. “The fact that alterations in brain function were observed after just a total of seven hours of training is remarkable,” explains UW-Madison psychology and psychiatry professor Richard J. Davidson, founder and chair of the Center for Investigating Healthy Minds and senior author of the article.

“There are many possible applications of this type of training,” Davidson says. “Compassion and kindness training in schools can help children learn to be attuned to their own emotions as well as those of others, which may decrease bullying. Compassion training also may benefit people who have social challenges such as social anxiety or antisocial behavior.”

Weng is also excited about how compassion training can help the general population. “We studied the effects of this training with healthy participants, which demonstrated that this can help the average person. I would love for more people to access the training and try it for a week or two — what changes do they see in their own lives?”

Both compassion and reappraisal trainings are available on the Center for Investigating Healthy Minds’ website. “I think we are only scratching the surface of how compassion can transform people’s lives,” says Weng.

Other authors on the paper were Andrew S. Fox, Alexander J. Shackman, Diane E. Stodola, Jessica Z. K. Caldwell, Matthew C. Olson, and Gregory M. Rogers.

The work was supported by funds from the National Institutes of Health; a Hertz Award to the UW-Madison Department of Psychology; the Fetzer Institute; The John Templeton Foundation; the Impact Foundation; the J. W. Kluge Foundation; the Mental Insight Foundation; the Mind and Life Institute; and gifts from Bryant Wanguard, Ralph Robinson, and Keith and Arlene Bronstein.

Journal Reference:

  1. H. Y. Weng, A. S. Fox, A. J. Shackman, D. E. Stodola, J. Z. K. Caldwell, M. C. Olson, G. M. Rogers, R. J. Davidson.Compassion Training Alters Altruism and Neural Responses to SufferingPsychological Science, 2013; DOI: 10.1177/0956797612469537

“eScience revoluciona a forma como se faz ciência” (Fapesp)

Novas ferramentas de computação possibilitam fazer ciência de forma melhor, mais rápida e com maior impacto, diz Tony Hey, vice-presidente da Microsoft Research (foto:E.Cesar/FAPESP)

16/05/2013

Por Elton Alisson

Agência FAPESP – Um software de visualização de dados astronômicos pela internet permite que cientistas em diversas partes do mundo acessem milhares de imagens de objetos celestes, coletadas por grandes telescópios espaciais, por observatórios e por instituições internacionais de pesquisa em astronomia.

Por meio desses dados, os usuários podem realizar análises temporais e combinar observações realizadas em vários comprimentos de onda de energia irradiada pelos corpos celestes, como raios X, radiação infravermelha, ultravioleta e gama e ondas de rádio, para elucidar os processos físicos que ocorrem no interior desses objetos e compartilhar suas conclusões.

Denominado World Wide Telescope, o software, que começou a ser desenvolvido em 2002 pela Microsoft Research, em parceria com pesquisadores da Universidade Johns Hopkins, nos Estados Unidos, é um exemplo de como as novas tecnologias da informação e comunicação (TICs) mudaram a forma como os dados científicos passaram a ser gerados, administrados e compartilhados, além da própria maneira como se faz ciência hoje, afirma Tony Hey, vice-presidente da Microsoft Research.

“Os telescópios espaciais, assim como as máquinas de sequenciamento genético e aceleradores de partículas, estão gerando um volume de dados até então nunca visto. Para lidar com esse fenômeno e possibilitar que os cientistas possam manipular e compartilhar esses dados, precisamos de uma série de tecnologias e ferramentas de ciência da computação que possibilitem fazer ciência de forma melhor, mais rápida e com maior impacto. É isso o que chamamos deeScience”, disse Hey durante o Latin American eScience Workshop 2013, realizado nos dias 14 e 15 de maio no Espaço Apas, em São Paulo.

Promovido pela FAPESP e pela Microsoft Research, o evento reuniu pesquisadores e estudantes da Europa, da América do Sul e do Norte, da Ásia e da Oceania para discutir avanços em diversas áreas do conhecimento possibilitados pela melhoria na capacidade de análise de grandes volumes de informações produzidas por projetos de pesquisa.

A cerimônia de abertura do evento foi presidida por Celso Lafer, presidente da FAPESP, e contou com a presença de Michel Levy, presidente da Microsoft Brasil, e de José Tadeu de Faria, superintendente do Ministério da Agricultura, Pecuária e Abastecimento no Estado de São Paulo, representando o ministro.

Também conhecida como ciência orientada por dados, a área de eScience integra pesquisas em computação a estudos nas mais variadas áreas por meio do desenvolvimento de softwares específicos para visualização e análise de informações.

A integração permite a interpretação dos dados, a formulação de teorias, testes por simulação e o levantamento de novas hipóteses de pesquisa com base em correlações difíceis de serem observadas sem o apoio da tecnologia da informação.

“Algumas tecnologias utilizadas na ciência da computação vão ajudar a resolver problemas científicos. Em contrapartida, a utilização dessas ferramentas para solucionar problemas científicos também possibilitará o próprio desenvolvimento da ciência da computação”, disse Hey, que foi professor da Universidade de Southampton, no Reino Unido.

Segundo Hey, a análise, visualização, prospecção (data mining, na expressão em inglês), preservação e compartilhamento de grandes volumes de dados representam grandes desafios não só na ciência hoje, mas também no setor privado.

Por isso, na opinião dele, é preciso treinar os cientistas para lidar com o big data – como é chamado o conjunto de soluções tecnológicas capaz de lidar com a acumulação contínua de dados pouco estruturados, capturados de diversas fontes e  da ordem de petabytes (quatrilhões de bytes) – tanto para realização de projetos científicos, como também para atuarem, eventualmente, em empresas. “O data scientist [cientista capaz de lidar com grandes volumes de dados] será um requisito imprescindível para o cientista”, disse Hey.

A ciência intensiva em dados não é nova, mas as escalas espaciais e temporais de estudos realizados atualmente sobre temas relacionados às mudanças climáticas globais, por exemplo, são cada vez maiores, exigindo novas ferramentas. Por meio de novas tecnologias da informação, também é possível analisar dados gerados em tempo real, como no monitoramento de hábitats.

De acordo com Hey, desde 1950 se começou a utilizar computadores para explorar, por meio de simulações, áreas da ciência até então inacessíveis. “No início, no entanto, os cientistas não sabiam o que era ciência da computação e os profissionais da computação não entendiam a complexidade dos problemas científicos”, disse.

“Foi necessária a realização de um trabalho conjunto, de longo prazo, para que os dois lados entendessem qual era a contribuição que cada um poderia dar em suas respectivas áreas, e iniciar o desenvolvimento de novos algoritmos, hardwaresoftware e da programação de linguagens para possibilitar a realização de experimentos em diversas áreas”, contou.

Oportunidades em temas ousados

Durante o evento da FAPESP e da Microsoft Research foram apresentados diversos projetos por pesquisadores que utilizam o eScience em diversos países, em áreas como energias renováveis, mudanças climáticas globais, transformações sociais, econômicas e políticas nas metrópoles contemporâneas, caracterização, conservação, recuperação e uso sustentável da biodiversidade, medicina e saúde pública.

Um desses projetos, coordenado pela professora Glaucia Mendes Souza, coordenadora do Programa FAPESP de Pesquisa em Bioenergia (BIOEN), pretende desenvolver um algoritmo para o sequenciamento do genoma da cana-de-açúcar e, com isso, possibilitar o desenvolvimento de variedades da planta com maior quantidade de sacarose e mais resistente a pragas e às mudanças climáticas.

“A colaboração entre a FAPESP e a Microsoft tem aberto para a comunidade científica do Estado de São Paulo inúmeras oportunidades de realizar pesquisas em temas ousados relacionados com o uso de tecnologias da informação em áreas como a de energia e meio ambiente”, disse Carlos Henrique de Brito Cruz, diretor científico da FAPESP, na sessão de abertura do workshop.

“Temos grandes expectativas em relação à eScience. Se soubermos utilizá-la adequadamente, ela poderá trazer grandes avanços não só em pesquisas mas também na própria maneira de se fazer ciência”, disse Brito Cruz.

Ele disse que a FAPESP planeja lançar em breve um programa voltado para apoiar pesquisas na área de eScience.

“Temos a clara convicção de que um papel importante da FAPESP é estar na vanguarda da inovação e do conhecimento, e consideramos muito importante o apoio à pesquisas em eScience, cuja aplicação em áreas como a de meio ambiente é inequívoca, mas que também apresenta um grande potencial de utilização nas Ciências Humanas, por exemplo”, disse Celso Lafer, presidente da FAPESP.

Levy destacou a parceria da Microsoft com a FAPESP e os investimentos em pesquisa e desenvolvimento realizados pela empresa no país. “A Microsoft tem aumentado seus investimentos na área de pesquisa e desenvolvimento no Brasil nos últimos anos e um dos mais importantes exemplos disso é a parceria bem sucedida que mantemos com a FAPESP”, afirmou.

Climate research nearly unanimous on human causes, survey finds (The Guardian)

Of more than 4,000 academic papers published over 20 years, 97.1% agreed that climate change is anthropogenic

, US environment correspondent

guardian.co.uk, Thursday 16 May 2013 00.01 BST

An iceberg melts in Greeland in 2007. Climate change. Environment. Global warming. Photograph: John McConnico/AP

‘Our findings prove that there is a strong scientific agreement about the cause of climate change, despite public perceptions to the contrary’. Photograph: John McConnico/AP

A survey of thousands of peer-reviewed papers in scientific journals has found 97.1% agreed that climate change is caused by human activity.

Authors of the survey, published on Thursday in the journal Environmental Research Letters, said the finding of near unanimity provided a powerful rebuttal to climate contrarians who insist the science of climate change remains unsettled.

The survey considered the work of some 29,000 scientists published in 11,994 academic papers. Of the 4,000-plus papers that took a position on the causes of climate change only 0.7% or 83 of those thousands of academic articles, disputed the scientific consensus that climate change is the result of human activity, with the view of the remaining 2.2% unclear.

The study described the dissent as a “vanishingly small proportion” of published research.

“Our findings prove that there is a strong scientific agreement about the cause of climate change, despite public perceptions to the contrary,” said John Cook of the University of Queensland, who led the survey.

Public opinion continues to lag behind the science. Though a majority of Americans accept the climate is changing, just 42% believed human activity was the main driver, in a poll conducted by the Pew Research Centre last October.

“There is a gaping chasm between the actual consensus and the public perception,” Cook said in a statement.

Guardian partners Climate Desk interview John Cook on his new paper

The study blamed strenuous lobbying efforts by industry to undermine the science behind climate change for the gap in perception. The resulting confusion has blocked efforts to act on climate change.

The survey was the most ambitious effort to date to demonstrate the broad agreement on the causes of climate change, covering 20 years of academic publications from 1991-2011.

In 2004, Naomi Oreskes, an historian at the University of California, San Diego,surveyed published literature, releasing her results in the journal Science. She too came up with a similar finding that 97% of climate scientists agreed on the causes of climate change.

She wrote of the new survey in an email: “It is a nice, independent confirmation, using a somewhat different methodology than I used, that comes to the same result. It also refutes the claim, sometimes made by contrarians, that the consensus has broken down, much less ‘shattered’.”

The Cook survey was broader in its scope, deploying volunteers from theSkepticalScience.com website to review scientific abstracts. The volunteers also asked authors to rate their own views on the causes of climate change, in another departure from Oreskes’s methods.

The authors said the findings could help close the gap between scientific opinion and the public on the causes of climate change, or anthropogenic global warming, and so create favourable conditions for political action on climate.

“The public perception of a scientific consensus on AGW [anthropogenic, ie man-made, global warming] is a necessary element in public support for climate policy,” the study said.

However, Prof Robert Brulle, a sociologist at Drexel University who studies the forces underlying attitudes towards climate change, disputed the idea that educating the public about the broad scientific agreement on the causes of climate change would have an effect on public opinion – or on the political conditions for climate action.

He said he was doubtful that convincing the public of a scientific consensus on climate change would help advance the prospects for political action. Having elite leaders call for climate action would be far more powerful, he said.

“I don’t think people really want to come around to grips with the fact that climate change is a highly ideological issue and it is not amenable to the information deficit model,” he said.

“The information deficit model, this idea that if you just pile on more information people will get convinced, is just completely inadequate, he said. “It strengthens the people who actually read and pay attention but it is certainly not going to change or shift the opinions of others.”

Jon Krosnick, professor in humanities and social sciences at Stanford university and an expert on public opinion on climate change, said: “I assume that sceptics would say that there is bias in the editorial process so that the papers ultimately published are not an accurate reflection of the opinions of scientists.”

Tamed fox shows domestication’s effects on the brain (Science News)

Gene activity changes accompany doglike behavior

By Tina Hesman Saey

Web edition: May 15, 2013

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Taming silver foxes (shown) alters their behavior. A new study links those behavior changes to changes in brain chemicals. Tom Reichner/Shutterstock

COLD SPRING HARBOR, N.Y. – Taming foxes changes not only the animals’ behavior but also their brain chemistry, a new study shows.

The finding could shed light on how the foxes’ genetic cousins, wolves, morphed into man’s best friend. Lenore Pipes of Cornell University presented the results May 10 at the Biology of Genomes conference.

The foxes she worked with come from a long line started in 1959 when a Russian scientist named Dmitry Belyaev attempted to recreate dog domestication, but using foxes instead of wolves. He bred silver foxes (Vulpes vulpes), which are actually a type of red fox with white-tipped black fur. Belyaev and his colleagues selected the least aggressive animals they could find at local fox farms and bred them. Each generation, the scientists picked the tamest animals to mate, creating ever friendlier foxes. Now, more than 50 years later, the foxes act like dogs, wagging their tails, jumping with excitement and leaping into the arms of caregivers for caresses.

At the same time, the scientists also bred the most aggressive foxes on the farms. The descendents of those foxes crouch, flatten their ears, growl, bare their teeth and lunge at people who approach their cages.

The foxes’ tame and aggressive behaviors are rooted in genetics, but scientists have not found DNA changes that account for the differences. Rather than search for changes in genes themselves, Pipes and her colleagues took an indirect approach, looking for differences in the activity of genes in the foxes’ brains.

The team collected two brain parts, the prefrontal cortex and amygdala, from a dozen aggressive foxes and a dozen tame ones. The prefrontal cortex, an area at the front of the brain, is involved in decision making and in controlling social behavior, among other tasks. The amygdala, a pair of almond-size regions on either side of the brain, helps process emotional information.

Pipes found that the activity of hundreds of genes in the two brain regions differed between the groups of affable and hostile foxes. For example, aggressive animals had increased activity of some genes for sensing dopamine. Pipes speculated that tame animals’ lower levels of dopamine sensors might make them less anxious.

The team had expected to find changes in many genes involved in serotonin signaling, a process targeted by some popular antidepressants such as Prozac. Tame foxes are known to have more serotonin in their brains. But only one gene for sensing serotonin had higher activity in the friendly animals.

In a different sort of analysis, Pipes discovered that all aggressive foxes carry one form of the GRM3 glutamate receptor gene, while a majority of the friendly foxes have a different variant of the gene. In people, genetic variants of GRM3 have been linked to schizophrenia, bipolar disorder and other mood disorders. Other genes involved in transmitting glutamate signals, which help regulate mood, had increased activity in tame foxes, Pipes said.

It is not clear whether similar brain chemical changes accompanied the transformation of wolves into dogs, said Adam Freedman, an evolutionary biologist at Harvard University. Even if dogs and wolves now have differing brain chemical levels, researchers can’t turn back time to watch the process unfold; they can only guess at how domestication happened. “We have to reconstruct an unobservable series of steps,” he said. Pipes’ study is an interesting example of what might have happened to dogs’ brains during domestication, he said.

Clouds in the Head: New Model of Brain’s Thought Processes (Science Daily)

May 21, 2013 — A new model of the brain’s thought processes explains the apparently chaotic activity patterns of individual neurons. They do not correspond to a simple stimulus/response linkage, but arise from the networking of different neural circuits. Scientists funded by the Swiss National Science Foundation (SNSF) propose that the field of brain research should expand its focus.

A new model of the brain’s thought processes explains the apparently chaotic activity patterns of individual neurons. They do not correspond to a simple stimulus/response linkage, but arise from the networking of different neural circuits. (Credit: iStockphoto/Sebastian Kaulitzki)

Many brain researchers cannot see the forest for the trees. When they use electrodes to record the activity patterns of individual neurons, the patterns often appear chaotic and difficult to interpret. “But when you zoom out from looking at individual cells, and observe a large number of neurons instead, their global activity is very informative,” says Mattia Rigotti, a scientist at Columbia University and New York University who is supported by the SNSF and the Janggen-Pöhn-Stiftung. Publishing inNature together with colleagues from the United States, he has shown that these difficult-to-interpret patterns in particular are especially important for complex brain functions.

What goes on in the heads of apes

The researchers have focussed their attention on the activity patterns of 237 neurons that had been recorded some years previously using electrodes implanted in the frontal lobes of two rhesus monkeys. At that time, the apes had been taught to recognise images of different objects on a screen. Around one third of the observed neurons demonstrated activity that Rigotti describes as “mixed selectivity.” A mixed selective neuron does not always respond to the same stimulus (the flowers or the sailing boat on the screen) in the same way. Rather, its response differs as it also takes account of the activity of other neurons. The cell adapts its response according to what else is going on in the ape’s brain.

Chaotic patterns revealed in context

Just as individual computers are networked to create concentrated processing and storage capacity in the field of Cloud Computing, links in the complex cognitive processes that take place in the prefrontal cortex play a key role. The greater the density of the network in the brain, in other words the greater the proportion of mixed selectivity in the activity patterns of the neurons, the better the apes were able to recall the images on the screen, as demonstrated by Rigotti in his analysis. Given that the brain and cognitive capabilities of rhesus monkeys are similar to those of humans, mixed selective neurons should also be important in our own brains. For him this is reason enough why brain research from now on should no longer be satisfied with just the simple activity patterns, but should also consider the apparently chaotic patterns that can only be revealed in context.

Journal Reference:

  1. Mattia Rigotti, Omri Barak, Melissa R. Warden, Xiao-Jing Wang, Nathaniel D. Daw, Earl K. Miller, Stefano Fusi. The importance of mixed selectivity in complex cognitive tasksNature, 2013; DOI: 10.1038/nature12160