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Food- and cocaine-reinforced responding during and after d-amphetamine treatment. Ordinate number of reinforcers, expressed as a percent of reinforcers earned under baseline conditions. Points represent mean (±SEM) data for three monkeys. Abscissa day during d-amphetamine treatment (0.03 mg/kg/h), during a 6-day drug-free period and during cocaine self-administration. Other details as in Fig. 2
