By examining living primates, Robin Dunbar was able to determine that __________ was related to brain size.

Question

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Robin Dunbar's research found that group size was closely related to brain size in primates, specifically the neocortex volume, which is responsible for higher cognitive functions such as language, problem-solving, and social interactions. This is known as Dunbar's number, which suggests that there is a cognitive limit to the number of social relationships that a primate species can sustain.

By Examining Living Primates, Robin Dunbar Was Able to Determine