Figure 2
From: People punish defection, not failures to conform to the majority
Example trial of the Prisoner’s Dilemma game with costly punishment. In this example trial, the participant cooperated while the partner defected which led to a loss of 10 points for the participant and a gain of 20 points for the partner. The participant then chose to morally punish the partner by investing 2 points so that 20 points were subtracted from the partner’s account balance. The partner’s photograph was randomly selected from the Chicago Face Database55.
