A reversed PRE.

Abstract
RATS WERE TRAINED IN A FREE OPERANT SITUATION IN WHICH 1 STIMULUS WAS ASSOCIATED WITH CONTINUOUS REINFORCEMENT (CRF) AND A 2ND STIMULUS WITH VARIABLE RATIO (VR) 3. THE STIMULI ALTERNATED EACH 30 SEC. DURING EXTINCTION EACH S EMITTED MORE RESPONSES IN THE PRESENCE OF THE CRF STIMULUS THAN IN THE VR STIMULUS-A REVERSED PARTIAL-REINFORCEMENT EFFECT (PRE). CONTROLS TRAINED ON EITHER CRF OR VR, YIELDED A CONVENTIONAL PRE DURING EXTINCTION. COMPARISONS WITH THE CONTROLS INDICATE THAT THE REVERSED PRE STEMMED FROM BOTH A SUPPRESSION OF REPONDING IN THE VR STIMULUS AND AN ENHANCEMENT OF RESPONDING IN THE CRF STIMULUS. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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