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The social-brain hypothesis refers to a quantitative relationship between social-group size and neocortex volume in monkeys and apes. This relationship predicts a group size of approximately 150 for humans, which turns out to be the typical size of both social communities in small-scale societies and personal social networks in the modern world. This constraint on the size of social groups is partly cognitive and partly temporal. It gives rise to a layered structure in primate and human social groups that, in humans, reflects both emotional closeness in relationships and the frequency of contact. These findings have potentially important implications for the way in which human organizations are structured. © The Author(s) 2014.

Original publication

DOI

10.1177/0963721413517118

Type

Journal article

Journal

Current Directions in Psychological Science

Publication Date

01/01/2014

Volume

23

Pages

109 - 114