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Overshadowing and Stimulus Duration

Lookup NU author(s): Dr Domhnall Jennings


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In 3 experiments, the authors investigated the effect of stimulus duration on overshadowing. Experiments 1 and 2 examined responding to a target conditioned stimulus (CS1) when it was conditioned in compound with a coterminating overshadowing stimulus (CS2) that was longer, shorter, or of the same duration (the long, short, and matched groups, respectively). Equal overshadowing of conditioning to CS1 was obtained in all 3 conditions relative to a control group conditioned to the light alone. There were, however, differences in responding to CS2 as a function of its absolute duration. Experiment 3 examined the contribution of the food-food interval/CS onset-food interval ratio to these findings. In Experiments 1 and 2, the ratio differed for the overshadowing CS but not for the target CS. In Experiment 3, this arrangement was reversed, but the pattern of results remained the same. The implications of these findings for trial-based and real-time models of conditioning are discussed. © 2007 American Psychological Association.

Publication metadata

Author(s): Jennings DJ, Bonardi C, Kirkpatrick K

Publication type: Article

Publication status: Published

Journal: Journal of Experimental Psychology: Animal Behavior Processes

Year: 2007

Volume: 33

Issue: 4

Pages: 464-475

ISSN (print): 0097-7403

ISSN (electronic): 1939-2184

Publisher: American Psychological Association


DOI: 10.1037/0097-7403.33.4.464

PubMed id: 17924793


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