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Switching from sucrose to saccharin: Extended successive negative contrast is not maintained by hedonic changes.

Rehn, Simone, Boakes, Robert and Dwyer, Dominic ORCID: 2023. Switching from sucrose to saccharin: Extended successive negative contrast is not maintained by hedonic changes. Journal of Experimental Psychology: Animal Learning and Cognition 49 (4) , pp. 289-295. 10.1037/xan0000362

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Previous experiments found that acceptance of saccharin by rats was reduced if they had prior experience of sucrose or some other highly palatable solution. This reduction in saccharin consumption was particularly extended after a switch from sucrose. On the surface, this seems to correspond to a successive negative contrast (SNC) effect. This term was coined by C. F. Flaherty to describe the situation where consumption of a target solution is reduced by prior experience of a more valuable solution, typically a more concentrated version of the target solution. However, SNC effects are normally transient and assessed relative to a nonshifted control. Here, we confirm that the reduction in consumption seen when shifting from sucrose to saccharin is persistent and is seen relative to the traditional unshifted control. In addition, an analysis of licking microstructure showed that the shift from sucrose to saccharin suppressed the hedonic value of saccharin relative to controls, but this effect was less persistent than consumption suppression. Interestingly, a similar dissociation is observed in extinction of conditioned taste aversion (CTA): suppression of consumption produced by CTA is far more persistent than suppression of hedonic value. The comparison of results across procedures suggests that persistent SNC produced by a qualitative downshift from sucrose to saccharin appears different from quantitative downshifts in the concentration of a single solution, and qualitative downshift effects may involve CTA.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Psychology
Publisher: American Psychological Association
ISSN: 2329-8456
Date of First Compliant Deposit: 17 July 2023
Date of Acceptance: 16 July 2023
Last Modified: 17 Nov 2023 16:44

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