Evolutionary Basis for Altruism?

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UCLA study points to evolutionary roots of altruism, moral outrage

If you've ever been tempted to drop a friend who tended to freeload, then you have experienced a key to one of the biggest mysteries facing social scientists, suggests a study by UCLA anthropologists. "If the help and support of a community significantly affects the well-being of its members, then the threat of withdrawing that support can keep people in line and maintain social order," said Karthik Panchanathan, a UCLA graduate student whose study appears in Nature. "Our study offers an explanation of why people tend to contribute to the public good, like keeping the streets clean. Those who play by the rules and contribute to the public good will be included and outcompete freeloaders." This finding -- at least in part -- may help explain the evolutionary roots of altruism and human anger in the face of uncooperative behavior, both of which have long puzzled economists and evolutionary biologists, he said.

"If you put two dogs together, and one dog does something inappropriate, the other dog doesn't care, so long as it doesn't get hurt," Panchanathan said. "It certainly wouldn't react with moralistic outrage. Likewise, it wouldn't experience elation if it saw one dog help out another dog. But humans are very different; we're the only animals that display these traits."

The study, which uses evolutionary game theory to model human behavior in small social groups, is the first to show that cooperation in the context of the public good can be sustained when freeloaders are punished through social exclusion, said co-author Robert Boyd, a UCLA professor of anthropology and fellow associate in UCLA's Center for Behavior, Evolution and Culture.

Full: http://www.eurekalert.org/pub_releases/2004-11/uoc--usp112404.php