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Us and them, and our brains.


Political arguments, moral judgment and social conflicts are among the most complex social behaviors that humans engage in, yet we perform these things with a brain that is not so much different from that of a chimpanzee. There is definitely an interest in understanding what happens in the brain when people argue, fight, judge, stereotype or segregate, but scientific advancement on this controversial issue is rather slow1,2,3,4.

A recent paper published in Behavioral and Brain Sciences5 reviews data from psychology and sociology on prejudice and discrimination and asks a provocative question: Is getting us to like one another more the s...