Effects of lateral hypothalamic lesions and vagotomy on meal patterns in rats

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Studied meal patterns with liquid diets in 4 female Carworth CFE albino rats with lateral hypothalamic (LH) lesions and in 4 Ss with sham lesions, both before and after vagotomy. LH Ss reduced total intake following lesions but showed no differences from controls after vagotomy on measures of total daily intake, mean meal size, and frequency of feeding. Identical frequency distributions of meal sizes and intermeal interval durations were found in LH and control Ss after vagotomy. However, although sham-lesioned Ss showed significant positive correlations between meal size and subsequent intermeal-interval durations in all phases of the experiment, the LH Ss showed no such correlation following vagotomy. Thus, indices of microregulatory controls may be more sensitive in indicating feeding deficits. (25 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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