Figure 3.

Percentage of correct recall of round 20 to 1 of the Prisoner’s Dilemma game by unconstrained-memory players (gray, n = 14) and constrained-memory players (black, n = 13). Correct recall = 1; incorrect = 0; undecided = 0.5. White area shows significant deviations from 50%, P < 0.05, one-tailed (no negative memory assumed). Correct recall on round 19 is significantly different between unconstrained- and constrained-memory players (z = 1.871, P = 0.038, directed).