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