Document Detail


Hyper-homeostatic learning of anticipatory hunger in rats.
MedLine Citation:
PMID:  17540415     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Anticipatory hunger is a learnt increase in intake of food having a flavour or texture that predicts a long fast. This learning was studied in rats trained on a single food or a choice between protein-rich and carbohydrate-rich foods, presented for 1.5 h after 3 h without maintenance food at the start of the dark phase. Eight training cycles provided a pseudo-random sequence of 3 h and 10 h post-prandial fasts with a day on maintenance food between each training fast. The measure of anticipatory hunger is the difference over one 4-day cycle between the intake of test food having an odour predictive of the longer fast (TL) and intake of food with an odour cuing to the shorter fast (TS). Previous experiments showed that conditioning of preference for the odour before the shorter fast competes with learning to avoid hunger during the longer fast (anticipatory hunger), generating a cubic or quartic contrast. TL minus TS showed a strong cubic trend over 8 training cycles with both single and choice meals. There was a switch from preference for the short-fast odour at cycle 2 (TL-TS=-0.86 g) to a peak of anticipatory hunger at cycle 6 (TL-TS=1.57 g). We conclude that anticipatory hunger is learnt when a choice is given between protein-rich and carbohydrate-rich foods as well as on a single food. In addition, since anticipatory hunger extinguishes itself, such learning improves on negative-feedback homeostasis with a feed-forward "hyper-homeostatic" mechanism.
Authors:
Soghra Jarvandi; David A Booth; Louise Thibault
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-05-03
Journal Detail:
Title:  Physiology & behavior     Volume:  92     ISSN:  0031-9384     ISO Abbreviation:  Physiol. Behav.     Publication Date:  2007 Nov 
Date Detail:
Created Date:  2007-11-05     Completed Date:  2008-01-29     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0151504     Medline TA:  Physiol Behav     Country:  United States    
Other Details:
Languages:  eng     Pagination:  541-7     Citation Subset:  IM    
Affiliation:
School of Dietetics and Human Nutrition, Macdonald Campus of McGill University, 21111 Lakeshore Road, Ste-Anne-de-Bellevue, Quebec, Canada H9X 3V9.
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MeSH Terms
Descriptor/Qualifier:
Adaptation, Physiological
Animals
Appetite Regulation / physiology*
Appetitive Behavior / physiology
Association Learning / physiology*
Choice Behavior
Discrimination (Psychology) / physiology
Eating / physiology,  psychology
Female
Food Preferences / physiology*,  psychology
Generalization (Psychology)
Hunger / physiology*
Odors
Postprandial Period / physiology*
Rats
Rats, Sprague-Dawley
Satiation / physiology
Statistics, Nonparametric
Taste / physiology
Time Factors

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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