Rhesus monkeys (n = 5), surgically implanted with double-lumen catheters, were allowed to self-administer cocaine (0.1 or 0.3mg/kg/injection, i.v.) on one lever (COC lever) under several fixed-interval schedules of reinforcement. Responding on a second lever (SAL lever) delivered saline (i.v.) under a fixed-ratio 1 schedule. Responding on both levers was a… (More)
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