Effect of punishment duration and intensity on the extinction of an instrumental response.

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Abstract
Two factorial experiments were carried out in which a learned barriercrossing response by rats was punished with shocks of various durations and intensities during extinction. Each response during extinction was punished in Experiment I until a criterion of extinction was attained; only the 1st response during extinction was punished in Experiment n. In general, the degree of depression in response strength produced by punishment was directly related to its intensity and to its duration. Amount of postpunishment recovery of response strength appeared to be directly related to the degree of depression induced by punishment.

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