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. 1980 Jan;33(1):59–76. doi: 10.1901/jeab.1980.33-59

Choice of timeout during response-independent food schedules

Tore Lydersen, David Perkins, Stan Thome, Edgar Lowman
PMCID: PMC1332913  PMID: 16812162

Abstract

Rats' lever pressing terminated visual or auditory stimuli associated with fixed-time or variable-time schedules of food delivery and produced a timeout period during which food delivery could not occur. Lever pressing during a timeout period reinstated the food-associated stimuli and again permitted food delivery according to the fixed-time or variable-time schedules. The mean interfood interval ranged from 1 minute to 16 minutes (variable-time schedules) or 32 minutes (fixed-time schedules); the timer controlling schedule intervals did not stop during timeout periods. The percentage of session time spent in timeout increased when the mean interfood intervals were lengthened and decreased when the mean interfood intervals were shortened. Timeouts were initiated most frequently about half way between successive food deliveries (fixed-time schedules) or after 15 seconds or more had lapsed since the last food delivery (variable-time schedules). Elimination of food delivery increased the percentage of session time spent in timeout, and elimination of the timeout contingency decreased lever press rates. When timeout was produced only when the lever was held in the depressed position, little time was spent in timeout. The main determinants of timeout initiation and termination appeared to be the rate of food delivery, freedom of movement during timeout, and the stimulus change associated with initiation and termination of timeout.

Keywords: schedule-induced timeout, fixed-time schedules, variable-time schedules, extinction, lever press, lever hold-down, rats

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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