Social neu­ro­science is a rapidly growing dis­ci­pline that exam­ines the rela­tion­ship between the brain and social behavior. The “€œsocial brain hypoth­esis”€ posits that, over evo­lu­tionary time, living in large, social groups favored the phys­ical growth of brain regions impor­tant for social behavior. In non-​​human pri­mates, some evi­dence indi­cates that the size of the amyg­dala is related to social behavior.

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