Author: Mackintosh, N.J.
Description: Two experiments on conditioned suppression in rats examined overshadowing between visual and auditory components of a compound conditioned stimulus. In the first experiment, when one component was markedly more salient than the other, the more salient overshadowed the less salient, but the latter, although acquiring significant associative strength, did not overshadow the former. When the two components were of approximately equal salience, each overshadowed the other. In the second experiment, reciprocal overshadowing was again observed between two equally salient stimuli, but only when their absolute intensities were relatively low. The failure to observe reciprocal overshadowing under all conditions raises problems for those theories of stimulus selection which assume that stimuli compete for some strictly limited resource. It was suggested, instead, that overshadowing might occur when animals fail to learn to attend to, or actually learn to ignore, stimuli that are not uniquely successful predictors of reinforcement.
Subject Headings: Conditioned Stimulus; Test Trial; Suppression Ratio; Associative Strength; Conditioned Suppression
Keywords: Overshadowing and stimulus intensity
Publication year: 1976
Journal or book title: Animal Learning & Behavior
Volume: 4
Issue: 2
Pages: 186-192
Find the full text :Â https://link.springer.com/article/10.3758/BF03214033
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Type: Journal Article
Serial number: 2541