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Lever responding and food consumption after vehicle, 4.0 μg/side SCH 23390 or 0.4 μg/side SKF 81297 within the AId during 1-hr food maintenance test sessions. Values are the mean (±SEM) number of active lever responses (A) and food pellets earned (B) during the first (left) and last (right) 30mins of the 1-hr sessions. * p < 0.05 compared to vehicle.
