The Cultural Brain Hypothesis: How culture drives brain expansion, sociality, and life history
Table 1
Correlations for each regime across our entire parameter space.
Correlations between log mean brain size, log mean adaptive knowledge, log mean group size, mean social learning, and mean juvenile period with 95% confidence intervals in brackets. The table has been color coded from red (r = −1) to white (r = 0) to blue (r = 1) for ease of comprehension. The upper table has correlations across the entire parameter space. The lower table has primarily asocial learners (s < .5) in the bottom triangle and primarily social learners (s > .5) in the top triangle. Following the empirical literature, social learning is defined as the number of observed incidents of social learning. Thus, we multiplied s by mean group size (N), and then following the empirical work, added 3, and took the natural log [46]. The juvenile period is defined as the probability of socially learning in a second round of learning (sv). Higher sv values should demand a longer juvenile period.