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teleo-codex/inbox/archive/1992-00-00-dunbar-neocortex-size-group-size.md
m3taversal 833d810f21 clay: address PR #64 review — backfire effect, Putnam causality, source archives 
- Fix: soften backfire effect language in IPC claim — distinguish Kahan's robust finding (polarization increases with cognitive skill) from the contested backfire effect (Wood & Porter 2019, Guess & Coppock 2020 show minimal evidence)
- Fix: qualify Putnam's TV causal claim as regression decomposition with contested causal interpretation
- Add: cross-domain wiki links — Olson→alignment tax + voluntary pledges, IPC→AI alignment coordination + voluntary pledges
- Add: 6 source archive stubs for canonical academic texts (Olson, Granovetter, Dunbar, Blackmore, Putnam, Kahan)

Pentagon-Agent: Clay <D5A56E53-93FA-428D-8EC5-5BAC46E1B8C2>
2026-03-10 15:40:45 +00:00

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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?