Why did encephalization occur?

Several hypotheses have been presented as to why human brains are so large. One of them is Robin Dunbar’s “social brain hypothesis.” Dunbar found that there was a correlation between the average size of primate groups and their neocortex ratio,* and he argued that social complexity affected brain growth.

■References (Books, papers, Web articles, etc.)
Human Evolution: Our Brains and Behavior  Robin Dunbar Oxford University Press; 1 edition (November 28, 2016)
Grooming, Gossip, and the Evolution of Language  Robin Dunbar Harvard University Press; First Paperback edition (October 1, 1998)

*The neocortex ratio is the ratio of the neocortex to the rest in the cerebrum. In general, the larger the population is, the larger the primate neocortex ratio is.

Related iCards: The “magic number” for human social groups (Vol 2.) / Brain growth and group formation in humans (Vol 1.)

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