Overshadowing by fixed- and variable-duration stimuli

Bonardi, Charlotte and Mondragón, Esther and Brilot, Ben and Jennings, Dómhnall J. (2015) Overshadowing by fixed- and variable-duration stimuli. Quarterly Journal of Experimental Psychology, 68 (3). pp. 523-542. ISSN 1747-0226

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Two experiments investigated the effect of the temporal distribution form of a stimulus on its ability to produce an overshadowing effect. The overshadowing stimuli were either of the same duration on every trial, or of a variable duration drawn from an exponential distribution with the same mean duration as that of the fixed stimulus. Both experiments provided evidence that a variable-duration stimulus was less effective than a fixed-duration cue at overshadowing conditioning to a target conditioned stimulus (CS); moreover, this effect was independent of whether the overshadowed CS was fixed or variable. The findings presented here are consistent with the idea that the strength of the association between CS and unconditioned stimulus (US) is, in part, determined by the temporal distribution form of the CS. These results are discussed in terms of time-accumulation and trial-based theories of conditioning and timing.

Item Type: Article
Additional Information: This is an Accepted Manuscript of an article published by Taylor & Francis in Quarterly Journal of Experimental Psychology on 1 Oct 2014, available online: http://www.tandfonline.com/10.1080/17470218.2014.960875.
Keywords: Rats, Timing, Overshadowing, Associative learning, Stimulus distribution form
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Psychology
Identification Number: https://doi.org/10.1080/17470218.2014.960875
Depositing User: Eprints, Support
Date Deposited: 02 Oct 2017 14:40
Last Modified: 13 Oct 2017 04:35
URI: http://eprints.nottingham.ac.uk/id/eprint/46925

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