Conditioned carbohydrate appetite in rats.
Item
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Title
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Conditioned carbohydrate appetite in rats.
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Identifier
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AAI9108097
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identifier
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9108097
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Creator
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Elizalde, Graciela Monica.
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Contributor
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Adviser: Anthony Sclafani
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Date
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1990
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Language
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English
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Publisher
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City University of New York.
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Subject
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Psychology, Experimental | Psychology, Psychobiology
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Abstract
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The present examined the appetite conditioning effect of carbohydrates using a conditioned flavor preference paradigm. Adult female rats were fitted with two intragastric (IG) catheters and were trained to drink flavored water (CS+; e.g., cherry-water) paired with IG infusions of 32% Polycose. On alternate days a different flavor (CS{dollar}-{dollar}; grape-water) was paired with IG water infusions. The CSs and chow were available 23 hours/day. In two-choice tests the rats displayed strong preferences for the CS+ over the CS{dollar}-{dollar} as well as over plain water. The latter finding contrasts with the mild aversion naive rats displayed to the CS flavors. The CS+ preference persisted for several weeks during extinction tests when both the CS+ and CS{dollar}-{dollar} were paired with IG water or no infusions. The acquired preference for the CS+ flavor was not as strong, however, as the rats' innate preferences for the taste of saccharin or Polycose. Also, unlike their response to saccharin and Polycose, the rats' acceptance (absolute intake) of the CS+ was not elevated. Increased acceptance was also not obtained in a second experiment in which the initial palatability of the CS flavors was enhanced by the addition of Polycose. However, in a third experiment, which used a different set of flavors (bitter vs. sour), a conditioned increase in CS+ intake was observed. The third experiment also examined the rats' orofacial reactions to intraoral infusions of the CS+ and CS{dollar}-{dollar} flavors. Despite their strong conditioned preference for the CS+ over the CS{dollar}-{dollar}, the rats did not differ in their ingestive or aversive orofacial reactions to the CSs. This suggests that the palatability of the CS+ was not enhanced by the conditioning process.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
