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To investigate the effects of various prefeeding intervals on operant performance (time of partial satiation prior to assessment), adult male Sprague-Dawley rats were trained on two operant tasks: a temporal response differentiation (TRD) task thought to measure time discrimination and a progressive ratio (PR) task thought to measure motivation to work for food reinforcers. Endpoints included percent...
Key pressing of rats was maintained under multiple and discrete-trial choice schedules with reinforcer units of 45mg food pellets or 3.5s dips of sucrose solution. Both smaller and larger fixed ratio (FR) schedules were associated with the same unit price in a manner, for example, that each of eight iterations of FR120 was associated with delivery of a single reinforcer unit and one instance of FR960...
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