Rats with hippocampal lesions (HC), cortical control lesions, or sham operations were trained to lever press on a differential reinforcement of low rates (DRL) schedule requiring 12 sec between responses. In four experiments, factors affecting performance efficiency in this paradigm were manipulated. Providing extra opportunities for collateral mediating behavior (Experiment 1) aided all groups nondifferentially. Adding a limited hold (Experiment 2) or administering chlordiazepoxide HCl (Expe...Expand abstract
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The hippocampus, collateral behavior, and timing.
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