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Behavioral results of subjective ratings of motivations using the visual analogue scale (VAS) and proportions (percentage) of retrieval accuracies for hit responses in high confidence (High‐confidence Hit). These data were analyzed by two‐way repeated measures ANOVAs with the factors of reward (High reward and Low reward) and task difficulty (Difficult and Easy). Error bars represent standard errors. **P < 0.01, *P < 0.05.
