Document Detail

Associative changes with a random CS-US relationship.
MedLine Citation:
PMID:  11131789     Owner:  NLM     Status:  MEDLINE    
Three experiments examined conditioned magazine approach in rats when a positive unconditioned stimulus (US) bore a random relation to a conditioned stimulus (CS). Experiment 1 found that over the course of conditioning the CS initially elevated responding relative to the baseline but then lost the power to do so. Transfer tests revealed that a CS-US association developed early and persisted despite the decline in magazine responding. Experiment 2 confirmed the persistence of CS-US associations and found them to be more substantial when a different US occurred during the CS than in its absence. In Experiment 3, when the situation was exposed to US-alone presentations prior to introducing the CS, there was little evidence that a subsequent random relation between the CS and US produced an association between them. These results agree with those of blocking and overshadowing experiments using discrete CSs and support an interpretation of the random procedure in terms of competition between the background and CS for conditioning.
R A Rescorla
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  The Quarterly journal of experimental psychology. B, Comparative and physiological psychology     Volume:  53     ISSN:  0272-4995     ISO Abbreviation:  Q J Exp Psychol B     Publication Date:  2000 Nov 
Date Detail:
Created Date:  2000-12-22     Completed Date:  2001-02-15     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8107270     Medline TA:  Q J Exp Psychol B     Country:  England    
Other Details:
Languages:  eng     Pagination:  325-40     Citation Subset:  IM    
Department of Psychology, University of Pennsylvania, 3815 Walnut Street, Philadelphia, PA 19104-6196, USA.
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MeSH Terms
Association Learning*
Conditioning, Classical*
Rats, Sprague-Dawley
Reinforcement Schedule*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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