Abstract
A group of rats that received daily doses of chlordiazepoxide before testing on a discrimination problem on a Lashley jumping apparatus persisted longer in prelearning preferences, had higher learning scores, and produced more learning failures than a no-drug group. Since 93% of the no-drug group solved the problem, the fear engendered by responding to the incorrect (locked) window was not great enough to produce conflict and fixations, but since the performance of the chlordiazepoxide treated animals was inferior, it is suggested that the drug attenuated the incentive value of the negative reinforcement of incorrect responses.
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