Abstract
Rats given acquisition and extinction training in discrete lever-pressing trials in lieu of the conventional runway were required to complete a fixed ratio of responses on a retractable lever to end each trial. Magnitude of reward (large or small) and schedule of reinforcement (continuous or partial) was signaled during each trial. Contrary to the classic effects of these variables between subjects, there was greater resistance to extinction with continuous than partial reinforcement (a reversed effect of partial reinforcement) at both magnitudes of reward; greater resistance to extinction with large than small magnitudes at both schedules; and no interaction of magnitude and schedule in resistance to extinction.
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