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The effects of bilateral injections of D1 or D2 antagonists into the PL on performance of the nondelayed RF task. A, Number of errors (mean ± SEM) made during the nondelayed RF task by rats receiving saline (hatched bar): 0.05, 0.5, and 5 μg of SCH-23390 (black bars) into the PL. B, Number of errors (mean ± SEM) made during the nondelayed RF task by rats receiving PBS (hatched bar): 0.05, 0.5, and 5 μg of sulpiride (black bars) into the PL.
