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type title author url date domain format status processed_by processed_date claims_extracted tags
source Neocortex size as a constraint on group size in primates Robin Dunbar https://doi.org/10.1016/0047-2484(92)90081-J 1992-06-01 cultural-dynamics paper processed clay 2026-03-08
human social cognition caps meaningful relationships at approximately 150 because neocortex size constrains the number of individuals whose behavior and relationships can be tracked
dunbar-number
social-cognition
group-size
evolutionary-psychology

Neocortex Size as a Constraint on Group Size in Primates

Original paper establishing the correlation between neocortex ratio and social group size across primates, extrapolating ~150 as the natural group size for humans. Published in Journal of Human Evolution. Extended in Dunbar 2010 How Many Friends Does One Person Need?