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Effects of saline, cocaine, amphetamine, and modafinil in three female rhesus monkeys trained to discriminate 0.18 mg/kg cocaine from saline (Upper panels) and four male rhesus monkeys trained to discriminate 0.4 mg/kg cocaine from saline (Lower panels). Each data point represents mean ± SEM data from a single determination. Abscissae: min or hr after drug or saline administration. Ordinates: Percent cocaine-appropriate responding.
