Correlates the sizes between an species' brain and their social group, indicating  a maximum size for how large a social group an individual can maintain. (For humans, it is 150, which is consistent with many functional hunter-gatherer groups and military units). 

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• A large brain aids in the managing of complex social relationships between conspecifics ("the social brain hypothesis"). 
• A large brain is fostered by the development of new skills and innovation that increase survivability (namely: innovations in behavior, use of tools, and social learning). 

Positive Selection Pressures of a Large Brain

Breedlove, S. & Watson, N. (2017). Behavioral neuroscience, eighth edition. Oxford University Press.

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