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Effects of continuous 7-day d-amphetamine (0.01-0.1 mg/kg/h) treatment on choice between methamphetamine and food in four rhesus monkeys. Abscissa: unit dose methamphetamine in mg/kg/injection. Left ordinate: percent methamphetamine choice. Right ordinate: percent food choice. All points represent mean ± SEM obtained during days 5-7 of each 7-day treatment period. Missing points indicate that the monkey failed to respond during that component.
