Abstract
The microregulatory patterns of food and water intake were examined in male and female rats bearing medical septal lesions and in sham-operated controls. Medial septal ablation, although not affecting the total amount of food or water ingested, resulted in a profound disruption of the pattern of intake. Circadian rhythmicity was disrupted for a period, returning to normal by 25 days postlesion. Permanent disruptions occurred in feeding patterns in the rats with septal lesions ingested more frequent but smaller meals. There was also a marked increase in food-intake-associated drinking and a decrease in non-food-intake-associated drinking. The results are interpreted to reflect two separate independent effects, a general circadian disruption and an alteration in requlatory behavior produced by a chronic depletion of body fluid.
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