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Am J Physiol Regul Integr Comp Physiol 259: R1228-R1235, 1990;
0363-6119/90 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 259, Issue 6 1228-R1235, Copyright © 1990 by American Physiological Society

ARTICLES

Learning to sham feed: behavioral adjustments to loss of physiological postingestional stimuli

J. D. Davis and G. P. Smith
University of Illinois, Chicago 60680.

The progressive increase in intake of a concentrated (0.8 M sucrose) solution seen when rats are first exposed to the sham-feeding procedure can be prevented by interspersing two real-feeding tests between each sham-feeding test. Under these conditions, sham intake is significantly larger than real intake but significantly smaller than intake on the fifth consecutive sham-feeding test. This result indicates that there is a learned negative-feedback signal based on the association of the taste and postingestive effects of 0.8 M sucrose which extinguishes under consecutive sham-feeding tests. Analysis of the rate of ingestion during the tests revealed that the conditioned negative-feedback signal operates during the first 6 min of a sham-feeding test that follows real-feeding tests. The effect of the absence of an unconditional negative-feedback signal appears from approximately 6 to approximately 20 min during a sham-feeding test.


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