An investigation of conditions determining contrast effects in differential reward conditioning.

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Abstract
64 RATS SERVED AS SS IN 2 EXPERIMENTS AIMED AT ISOLATING FACTORS RESPONSIBLE FOR A DISPARITY OF RESULTS IN RECENT STUDIES OF DIFFERENTIAL-REWARD CONDITIONING. CONTRARY TO A RECENT SUGGESTION, EXP. I, IN WHICH SS WERE REMOVED FROM THE GOAL CHAMBER IMMEDIATELY UPON EATING, FOUND A LARGE DEPRESSIVE-CONTRAST EFFECT (CE) IN SPITE OF MINIMAL CONFINEMENT TIME AT THE GOAL. EXP. II INDICATED THAT MUCH OF THE RECENT DISPARITY OF RESULTS WAS PROBABLY A FUNCTION OF START-BOX CONDITIONS, WHICH ARE A POTENT VARIABLE IN CONTROLLING THE MAGNITUDE OF THE CE IN ALLEY PERFORMANCE. THESE DATA SUGGESTED THAT, ON A GIVEN TRIAL, THE DEPRESSIVE CE IS MAXIMAL JUST AFTER S 1ST RECEIVES A CUE INDICATING THAT HE MUST RESPOND TO THE LESSER OF THE REWARD MAGNITUDES, AND THAT SHORTLY THEREAFTER THE CE ATTENUATES. IMPLICATIONS FOR FRUSTRATION THEORY ARE DISCUSSED. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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