Dunbar Number / 邓巴数

Dunbar Number / 邓巴数 is the approximate limit on the number of stable familiar relationships a person can maintain, presented in 83.梳毛、八卦及语言的进化：人际关系“邓巴数”，咱不服不行 as about 150. The episode links the number to [[RobinDunbar|Robin Dunbar / 罗宾·邓巴]]’s comparison between primate group size and neocortex capacity, then uses it to explain why human social life needs scalable maintenance tools.

The source does not treat 150 as a magic rule. Its value is as a frame for relationship bandwidth: as groups grow, a person has to track more alliances, reputations, obligations, and third-party ties. Language As Social Grooming / 语言作为社会性梳毛 then becomes one answer to that scaling pressure.

Key Claims

• The number is approximate and explanatory, not a strict cap on every person’s relationships.
• Its importance lies in the relationship between group size, cognitive load, and maintenance cost.
• Larger social groups make [[MachiavellianIntelligence|third-party social tracking]] more important.
• Language, gossip, ritual, art, and media can be read as ways of stretching relationship-maintenance capacity.
• Modern urban life can fall below the social contact people need even when digital platforms create many weak or low-touch connections.

Connections

• Robin Dunbar / 罗宾·邓巴 and [[GroomingGossipAndEvolutionOfLanguage|《梳毛、八卦及语言的进化》]] - author and source book.
• Social Grooming / 社会性梳毛 - lower-scale relationship-maintenance mechanism.
• Gossip As Social Grooming / 八卦作为社会性梳毛 and Language As Social Grooming / 语言作为社会性梳毛 - scalable social-maintenance mechanisms.
• Social Psychology / 社会心理学 and Social Reality Construction / 社会现实建构 - broader social-cognition context.
• Weak-Tie Opportunity - separate network concept about loose ties and nonredundant information.