Search for reasons for altruism

A new study on altruism;

The bottom line, he said, is that altruism may rely on a basic understanding that others have motivations and actions that may be similar to our own.

"It's not exactly empathy," he said, but something more primitive. "We think that altruism may have grown out of -- at least in part -- such a system."

Another expert said the Duke study raises even more questions than it answers.

"It's a really interesting study," said Paul Sanberg, director of the Center of Excellence for Aging and Brain Repair at the University of South Florida College of Medicine, in Tampa. "It would be really interesting, now though, to see if people who had damage to that [brain] area were much less altruistic."

Huettel said he's pondered that possibility. "For example, we don't know if people who are sociopaths, or people who are autistic, might show differences in this region," he said. "It's a good question, but we don't have data that shows anything one way or another. This is just a jumping-off point."