Fig. 4.

Experiment 3 task structure and results. a In the prisoner’s dilemma, subjects were presented with a matrix of how the payoff structure would work according to their choices and their partner’s choices. b A regression reveals decision to cooperate was predicted by greater tolerance to ambiguity. As in experiments 1 and 2, ambiguity attitudes are inverted. Fitted regression lines are plotted. Asterisks indicate significant differences (*p < .05). Error bars reflect 95% CIs