Stimulus specificity: Nonreward.

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Abstract
[Eighty] rats were trained in the runway over 3 phases: partial reinforcement acquisition, Extinction I, and Extinction n. In Extinction I, nonrewarded confinement (NC) was either the same as or different from NC in acquisition; and in Extinction II, NC was shifted to the opposite value, again resulting in NC being the same as or different from acquisition NC. Early in Extinction I, response decrement was greater for different than for same groups, and later, 60-sec. NC produced slower terminal running than did 10-sec. NC. Similar results occurred in Extinction II. The results suggest that each NC occasions a distinctive stimulus and that extinction in the instrumental reward situation is to a considerable extent only generalized extinction.

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