Effects of acute administration of D-amphetamine sulfate or flupenthixol on performance in a fixed delays intertemporal choice task, in rats chronically exposed to cocaine or saline vehicle. Amphetamine (1 mg/kg) decreased impulsive choice in cocaine-naïve rats (repeated measures ANOVA: F(1,7) = 35.40, p <.01), but had no effect in rats with a history of cocaine administration (F(1,7) = .99, n.s.). The opposite effect ***Please ask au to confirm this change *** - ed was observed following administration of flupenthixol (0.5 mg/kg), which increased impulsive choice in cocaine-naïve rats (F(1,7) = 11.90, p <.05), but not in rats with a history of cocaine administration (F(1,7) = .06, n.s.).