Predators 'drove human evolution'
View at BBC NEWS
The popular view of our ancient ancestors as hunters who conquered all in their way is wrong, researchers have told a major US science conference.
Instead, they say, early humans were on the menu for predatory beasts.
This may have driven humans to evolve increased levels of co-operation, according to their theory.
Despite humankind's considerable capacity for war and violence, we are highly sociable animals, according to anthropologists.
James Rilling at Emory University in Atlanta, US, has been using brain imaging techniques to investigate the biological mechanisms behind co-operation.
He has imaged the brains of people playing a game under experimental conditions that involved choosing between co-operation and non-co-operation.
From the parts of the brain that were activated during the game, he found that mutual co-operation is rewarding; people reacted negatively when partners did not co-operate.
The popular view of our ancient ancestors as hunters who conquered all in their way is wrong, researchers have told a major US science conference.Instead, they say, early humans were on the menu for predatory beasts.
This may have driven humans to evolve increased levels of co-operation, according to their theory.
Despite humankind's considerable capacity for war and violence, we are highly sociable animals, according to anthropologists.
James Rilling at Emory University in Atlanta, US, has been using brain imaging techniques to investigate the biological mechanisms behind co-operation.
He has imaged the brains of people playing a game under experimental conditions that involved choosing between co-operation and non-co-operation.
From the parts of the brain that were activated during the game, he found that mutual co-operation is rewarding; people reacted negatively when partners did not co-operate.
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