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Carol Ward: Social interactions are the defining feature of humans, and have shaped all of modern human biology and have set us apart as a species.

You're listening to anthropologist Carol Ward, of the University of Missouri at Columbia. According to her research, our 'social intelligence' — how we learn to interact with each other — has played a large role in our evolution.

Carol Ward: [---1---] None of the other theories explain all of the aspects of human uniqueness and how it fits together.

Ward said that fossil records as well as archeological evidence of behavior show that the hominid brain increased 250 percent in less than 3 million years. [---2---] Humans needed large brains, she said, to negotiate different social settings and social groups.

Carol Ward: It's the interaction with members of our own species – [---3---]

I’m Lindsay Patterson, a clear voice for science. We’re at .

【視聽版科學(xué)小組榮譽出品】
And what we realized in looking at the data, and thinking about how the brain works, and how we're similar and different to other animals, that it's really the social interactions that have shaped human evolutionary history. Ward said that throughout human evolution, social interaction became increasingly important to evolutionary success. in terms of competition, cooperation, help that has shaped the evolution of the human brain and human abilities.