Figure 6
Fermi rule by different contexts compared with randomized sample for Plön experiment.
Panels from from left to right and from up to bottom represent the five possible contexts (respectively, from zero to four cooperating neighbours). Solid symbols represent the observed fraction of cooperative actions after playing D (circles) and defective actions after playing C (squares), as a function of the payoff difference between the focal player and the best of her neighbours that chose the opposite action. Empty symbols represent the results of 1000 randomizations of players' positions in the lattice. The error bars represent 99% confidence interval.
