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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. （加了一句话By using the average human brain size and extrapolating from the results of primates, he proposed that humans can comfortably maintain 150 stable relationships.[4]。）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'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. （加了一句话By using the average human brain size and extrapolating from the results of primates, he proposed that humans can comfortably maintain 150 stable relationships.[4]。）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".

邓巴数是一个建议的认知极限，用来限制与之保持稳定社会关系的人数，即一个人知道每个人是谁，以及每个人与其他每个人之间的关系。这个数字最早是在20世纪90年代由英国人类学家罗宾·邓巴 Robin Dunbar 提出的，他发现了灵长类动物大脑尺寸和平均社会群体大小之间存在相关性。通过人类大脑的平均大小并从灵长类动物的研究结果推断，他提出人类可以舒适地保持150种稳定的关系。邓巴通俗地解释它为“如果您碰巧来到一个酒吧，里面的人数刚刚好不会让你为不请自来地喝酒而感到尴尬。”

邓巴数Dunbar's number是一个建议的认知极限，用来限制与之保持稳定社会关系的人数，即一个人知道每个人是谁，以及每个人与其他每个人之间的关系。这个数字最早是在20世纪90年代由英国人类学家罗宾·邓巴 Robin Dunbar 提出的，他发现了灵长类动物大脑尺寸和平均社会群体大小之间存在相关性。通过人类大脑的平均大小并从灵长类动物的研究结果推断，他提出人类可以舒适地保持150种稳定的关系。邓巴通俗地解释它为“如果您碰巧来到一个酒吧，里面的人数刚刚好不会让你为不请自来地喝酒而感到尴尬。”

Dunbar, in Grooming, Gossip, and the Evolution of Language, proposes furthermore that language may have arisen as a "cheap" means of social grooming, allowing early humans to maintain social cohesion efficiently. Without language, Dunbar speculates, humans would have to expend nearly half their time on social grooming, which would have made productive, cooperative effort nearly impossible. Language may have allowed societies to remain cohesive, while reducing the need for physical and social intimacy. This result is confirmed by the mathematical formulation of the social brain hypothesis, that showed that it is unlikely that increased brain size would have led to large groups without the kind of complex communication that only language allows.

Dunbar, in Grooming, Gossip, and the Evolution of Language, proposes furthermore that language may have arisen as a "cheap" means of social grooming, allowing early humans to maintain social cohesion efficiently. Without language, Dunbar speculates, humans would have to expend nearly half their time on social grooming, which would have made productive, cooperative effort nearly impossible. Language may have allowed societies to remain cohesive, while reducing the need for physical and social intimacy. This result is confirmed by the mathematical formulation of the social brain hypothesis, that showed that it is unlikely that increased brain size would have led to large groups without the kind of complex communication that only language allows.

== Applications 应用 ==

== Applications 应用 ==