- Daniel Albohn, Penn State Univ.
- Reginald B. Adams, Jr., Penn State Univ.
Making sense out of others around us is complex. The ability to do so is arguably evolutionarily hardwired. Here, we extend the Social Brain Hypothesis (Dunbar, 1998), finding a positive relation between primate group size, expressive capacity, and neocortical volume. Results suggest that the primate brain and face co-evolved in a response to meet the social demands of one’s environment.