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The Social Face Hypothesis.

Daniel N Albohn1, Reginald B Adams2

  • 1The University of Chicago, Booth School of Business, Chicago, IL USA.

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|November 17, 2022
PubMed
Summary
This summary is machine-generated.

The primate face and brain co-evolved, with facial hairlessness predicting larger social groups and brain size. This suggests facial evolution is linked to social complexity.

Keywords:
EvolutionFaceFacial expressionPrimatesSocial perception

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Area of Science:

  • Evolutionary biology
  • Primatology
  • Neuroscience

Background:

  • Social complexity is a driving force in primate evolution.
  • The Social Brain Hypothesis links neocortical volume to social network size.
  • The Social Face Hypothesis proposes the face co-evolved with the brain for social signaling.

Purpose of the Study:

  • To empirically test the Social Face Hypothesis.
  • To investigate the co-evolution of primate brain, face, and social behavior.
  • To examine the relationship between facial features, brain size, and social network size.

Main Methods:

  • Collected data on primate facial hair bareness, social network size, and brain weight for 63 genera.
  • Replicated Dunbar's findings on brain size and social network size.
  • Analyzed the predictive relationship between facial hair bareness, group size, and brain weight.

Main Results:

  • Replicated the Social Brain Hypothesis: brain weight predicts social network size.
  • Facial hair bareness predicts both group size and brain weight.
  • Brain weight, facial hair bareness, and social network size are interdependent mediators.

Conclusions:

  • The primate brain and face appear to have co-evolved.
  • Facial evolution is influenced by the need to navigate complex social environments.
  • This supports the idea that social demands shape both brain and facial characteristics.