Λεπτομέρειες βιβλιογραφικής εγγραφής
| Τίτλος: |
The social face hypothesis: facial expressive capacity is associated with brain and social network size. |
| Συγγραφείς: |
Adams, Reginald B. Jr.1 (AUTHOR) radams@psu.edu, Xu, Brian Y.1 (AUTHOR), Albohn, Daniel N.2 (AUTHOR) |
| Πηγή: |
Behaviour. Aug2026, p1-19. 19p. |
| Θεματικοί όροι: |
*Facial expression & emotions (Psychology), *Size of brain, *Social evolution, *Human evolution, *Social belonging, *Social perception, *Primates |
| Περίληψη: |
Thirty years of work testing the Social Brain Hypothesis has repeatedly found that nonhuman primate overall brain size and neocortical volume is associated with a species social group size. Dunbar’s hypothesis weighed heavily on the idea that once our nonhuman primate ancestors descended from the trees and became diurnal, three important changes happened: (1) they gained visual access to one another, (2) their diet changed, and (3) they gained reliance on larger social networks for terrestrial survival. Some critics of the Social Brain Hypothesis pushed back on Dunbar’s conclusions claiming that differences in brain size are needed for colour vision to support foraging for diet, not for complex social visual perception. Missing from previous studies was a direct test implicating a role of social visual perception in the evolution of the brain, i.e., an association between facial expressive capacity, social network size and brain size. In the current paper, we review long standing theories that emphasise the importance of social visual signalling and perception in the evolution of the brain. As a result, we posit that it was not just the social brain that evolved. Once our evolutionary ancestors found themselves face-to-face, social demands also exerted pressure on the face to co-evolve to signal more complex mental and emotional information. We review evidence that supports this complementary hypothesis (i.e., the Social Face Hypothesis) and discuss its implications and added support for the Social Brain Hypothesis. [ABSTRACT FROM AUTHOR] |
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