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Effect of amphetamine on the probability of responding in the Fixed 60-s condition of the response inhibition (RI) task. Amphetamine increased the probability of responding across time. (For clarity, the data for 0.125 and 0.25 mg/kg doses are not displayed, but are significantly identical from the 0.0 mg/kg dose; *p<0.05 vs 0.0 mg/kg dose; error bar displays two standard errors of the difference).
