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Effects of the adenosine A1 receptor antagonist DPCPX (0.31 mg/kg i.p., n = 13, graphs on left; 2.5–10 mg/kg, n = 7, graphs on right) on the number of reinforcers obtained (top) and the total responses (bottom) made by rats performing on a DRL 72-s schedule. Open bars, vehicle; hatched bars, DPCPX. **, p < 0.01 compared with the vehicle condition.
