Abstract
Hungry rats were trained on a two choice discrimination task in a free responding situation in a Skinner box. One stimulus light and lever was associated with 100%, the other with 50%, food reinforcement, and the two stimuli alternated every 30 s. In extinction the rats made more responses in the presence of the 100% stimulus, but made more responses on the 50% lever. The rate of responding declined over the 7 days of extinction, but the percentage correct, after an initial drop, remained constant. These, and earlier results using similar paradigms, are interpreted in terms of Capaldi's (1966) theory of the partial reinforcement extinction effect.
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