Journal of the Experimental Analysis of Behavior
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Rats performed under a baseline variable-interval schedule of food presentation. A response-independent food schedule was then superimposed on the baseline schedule for different periods of time across different conditions. The response-independent schedule operated for the whole session in some conditions, intermittently for sixty second periods in some, and intermittently for ten-second periods in others. Under these latter two sets of conditions, the response-independent food schedule was stimulus correlated and alternated with the baseline schedule according to a multiple schedule. Response-independent food presentations always suppressed responding. The degree of suppression tended to increase the longer the period of response-independent food. Control conditions, in which the superimposed schedule was response-dependent, rather than response-independent, did not produce response suppression. The results fit an analysis of positive conditioned suppression phenomena in the context of multiple and concurrent schedule effects.
Stubbs, D. A.; Hughes, J. E.; and Cohen, S. L., "Positive Conditioned Suppression: An Explanation in Terms of Multiple and Concurrent Schedules" (1978). Psychology Faculty Scholarship. 34.
Stubbs DA, Hughes JE, Cohen SL. Positive conditioned suppression: an explanation in terms of multiple and concurrent schedules. J Exp Anal Behav. 1978 Nov;30(3):329-43. doi: 10.1901/jeab.1978.30-329. PMID: 16812113; PMCID: PMC1332777.
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