Second-order backward blocking and unovershadowing in human causal learning.
De Houwer, J. and Beckers, T. (2002) Second-order backward blocking and unovershadowing in human causal learning. Experimental Psychology, 49, (1), 27-33.
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De Houwer and Beckers (in press, Experiment 1) recently demonstrated that ratings about the relation between a target cue T2 and an outcome are higher when training involves CT1+ and T1T2+ followed by C+ trials than when training involves CT1+ and T1T2+ followed by C- trials. We replicated this study but now explicitly asked participants to rate the causal status of the cues both before and after the C+ or C- trials. Results showed that causal ratings for T2 were significantly higher after C+ trials than before C+ trials and that T2 received significantly lower ratings after C- trials than before C- trials. The results thus provide the first evidence for higher-order unovershadowing and higher-order backward blocking. In addition, the ratings for T1 revealed that first-order backward blocking (i.e., decrease in ratings for T1 as the result of C+ trials) was stronger than first-order unovershadowing (i.e., increase in ratings for T1 as the result of C- trials).
|Subjects:||B Philosophy. Psychology. Religion > BF Psychology|
|Divisions:||University Structure - Pre August 2011 > School of Psychology
|Date Deposited:||01 Aug 2008|
|Last Modified:||01 Jun 2011 07:11|
|Contributors:||De Houwer, J. (Author)
Beckers, T. (Author)
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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