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Means and standard errors for the interaction effect of reward and treatment on performance. Post-hoc simple main effects analyses revealed that after placebo as compared to methylphenidate (MPH) administration, a) the number of total responses (p=.02), b) the number of correct responses (p<.001) and c) the success rate (p<.001) were increased with reward. MPH thus inhibited a reward-induced increase in behavioral activity and performance improvement **p<.01.
