条件刺激と無条件刺激の負の随伴性の操作における2種類の方法とラットを用いた摂水反応の条件性抑制

概要

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The present experiments were designed to test the effects of negative contingencies of CS and US on conditioned suppression of licking in rats under conditions where P (USICS)-P (USInoCS) pairs were .50-.50, .25-.50, and 00-.50. The contingencies were manipulated by matching the session length in a Time-Matched (TM) condition, and by matching the number of USs in a NumberMatched (NM) condition. To assess conditioned inhibition, the retardation technique was used in Experiment 1 and the summation technique was used in Experiment 2. The two methods of manipulating contingencies did not affect conditioning differently. Additionally, clear evidence of conditioning of excitation was found under zero contingency (.50-.50). However, .25-.50 conditions yielded no evidence of conditioning, and the inhibition was conditioned under 00-.50 conditions. The results are discussed with reference to possible procedural artifacts and the Reseorla-Wagner model.
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