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Changes in the intake rate (mean inj/hr) for 1.5 mg/kg/inj cocaine under an FR1 schedule after 14 days of continuous d-amphetamine treatment. For each group, solid bars represent the baseline cocaine intake rate during the final day of FR1 training and hatched bars represent the cocaine intake rate after the d-amphetamine treatment period. * significant difference from baseline (p<0.01).
