Figure 2
Fixation proabilities (top) and times (bottom) as a function of the rate of cultural change (A, left) and the degree of amplification (B, right). In (A), no amplification is assumed: α = β = 1. Faster cultural change reduces the probability of adaptation, but much less so in smaller populations. In (B), the rate of cultural change is held steady at η = 0.1 and the population size is 1500. Greater amplification (larger α,β) increases fixation probability. In both, a small fitness difference is assumed: φ = 0.1.
