Figure 1

Network structure promotes the evolution of intuitive cooperation: As the density of network connections decreases, it becomes easier for selection to favor intuitive cooperators. Shown is the average intuitive response (S _i , probability of playing TFT) across different values of p (probability of repeated games) for cycles with different number of neighbors (k) for each node. (A) S _i for six representative values of k across the full range of  p. (B) Critical value of p at which S _i  = 0.5 across the full range of k. As k decreases, the transition from S _i  = 0 to S _i  = 1 occurs at lower values of p.