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Effect of expected reward size on error rate. Percentage of error trials (mean ± SE) as a function of reward size in (A) monkey TB and (B) in the average across 3 monkeys in the reward-size task. Black circles and gray triangles indicate valid (predictable) and random (unpredictable) conditions, respectively. The black curve is the best fit of Eq. 1 to the data collected in the valid cue condition.
