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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。”

邓巴数Dunbar's number是一个建议的认知极限，即一个人可以与多少人保持稳定的社会关系，在这种关系中，这个人知道每个人是谁，以及每个人与其他人的关系如何。邓巴数最早是在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体积与平均社群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，他提出人类可以轻松地与150个人保持稳定的人际关系。邓巴通俗地将其解释为“如果你碰巧在酒吧遇见了那些不请自来要和你一起喝酒的人，你也不会感到尴尬的人数。”

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. Dunbar's number states the number of people one knows and keeps social contact with, and it does not include the number of people known personally with a ceased social relationship, nor people just generally known with a lack of persistent social relationship, a number which might be much higher and likely depends on long-term memory size.

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. Dunbar's number states the number of people one knows and keeps social contact with, and it does not include the number of people known personally with a ceased social relationship, nor people just generally known with a lack of persistent social relationship, a number which might be much higher and likely depends on long-term memory size.

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 himself or herself if they met again.

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 himself or herself if they met again.