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Posttraining Shifts in the Overshadowing Stimulus–Unconditioned Stimulus Interval Alleviates the Overshadowing Deficit

ASU Author/Contributor (non-ASU co-authors, if there are any, appear on document)
James Denniston Ph.D., Associate Professor and Department Chairperson (Creator)
Institution
Appalachian State University (ASU )
Web Site: http://www.library.appstate.edu/

Abstract: Two conditioned lick suppression experiments explored the effects on overshadowing of a posttraining change in the temporal relationship between the overshadowing conditioned stimulus (CS) and the unconditioned stimulus (US). Rats received either trace (Experiment 1) or delay (Experiment 2) overshadowing training. Then pairings of the overshadowing CS and US were given with either a trace or delay temporal relationship. Overshadowing was alleviated by shifting the overshadowing CS–US temporal relationship so that it no longer matched the overshadowed CS–US temporal relationship. These outcomes are explicable in terms of an integration of the comparator hypothesis, which states that cue competition effects (e.g., overshadowing) will be maximal when the information potentially conveyed by competing CSs is equivalent, and the temporal coding hypothesis, which states that CS–US intervals are part of the information encoded during conditioning.

Additional Information

Publication
Blaisdell, A. P., Denniston, J. C., & Miller, R. R. (1999). Posttraining shifts in the overshadowing stimulus-US interval alleviates the overshadowing deficit. Journal of Experimental Psychology: Animal Behavior Processes, 25, 18-27. American Psychological Association (ISSN: 1939-2184) DOI: 10.1037/0097-7403.25.1.18
Language: English
Date: 1999
Keywords
overshadowing CS–UCS interval , cue competition effects in conditioned lick suppression, rats, test of comparator, temporal-coding hypotheses