The Cultural Brain Hypothesis: How culture drives brain expansion, sociality, and life history
Fig 13
Group size and the juvenile period.
(A) Our model’s empirical correlations between group size and the length of the juvenile period (r = −0.21 [Asocial], r = 0.22 [Social]). (B) Empirical correlation between group size and the length of the juvenile period among primates from Joffe (56) is r = 0.57.