Dunbar's Number
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A Dunbar's Number is a cognitive limit of the number of people with whom one can maintain stable social relationships (in which an individual knows who each person is and how each person relates to every other person).
- See: Neocortex, Social Group, Individual, Anthropology, Robin Dunbar, Friendship, Group Cohesiveness.
References
2022
- (Wikipedia, 2022) ⇒ https://en.wikipedia.org/wiki/Dunbar's_number Retrieved:2022-1-30.
- Dunbar's number is a suggested cognitive limit to the number of people with whom one can maintain stable social relationships—relationships in which an individual knows who each person is and how each person relates to every other person. This number was first proposed in the 1990s by British anthropologist Robin Dunbar, who found a correlation between primate brain size and average social group size. By using the average human brain size and extrapolating from the results of primates, he proposed that humans can comfortably maintain 150 stable relationships. There is some evidence that brain structure predicts the number of friends one has, though causality remains to be seen. Dunbar explained it informally as "the number of people you would not feel embarrassed about joining uninvited for a drink if you happened to bump into them in a bar." Dunbar theorised that "this limit is a direct function of relative neocortex size, and that this, in turn, limits group size [...] the limit imposed by neocortical processing capacity is simply on the number of individuals with whom a stable inter-personal relationship can be maintained". On the periphery, the number also includes past colleagues, such as high school friends, with whom a person would want to reacquaint themselves with if they met again. Proponents assert that numbers larger than this generally require more restrictive rules, laws, and enforced norms to maintain a stable, cohesive group. It has been proposed to lie between 100 and 250, with a commonly used value of 150. A replication of Dunbar's analysis with a larger data set and updated comparative statistical methods has challenged Dunbar's number by revealing that the 95% confidence interval around the estimate of maximum human group size is much too large (4–520 and 2–336, respectively) to specify any cognitive limit.