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Learning curves, group averages. Mean and +/− standard error at each block of 12 decision trials. Chance performance is 50%. Dotted vertical line after block 8 denotes reward contingency reversal. (A) easy (“large-difference”) trial pairs only, on which the two images differed in their probability of payoff by 50% or greater and (B) difficult (“small-difference”) trial pairs only, on which the images’ payoff probabilities differed by 25%.
