Reactivity of hyperphagic and normal rats to quinine and electric shock.

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Abstract
Lesions of the ventromedial hypothalamus of 25 female Sprague-Dawley rats which resulted in hyperphagia and obesity also produced a passive-avoidance deficit, i.e., increased the number of punished drinking responses. The passive-avoidance deficit appeared to be related to increased appetitive drive since it was not apparent when the water intake of the lesioned Ss was equated to that of controls. Results of other experiments demonstrate that hyperphagic Ss overreact to quinine adulteration of their ad-lib water but react normally to the addition of mild electric shock to their water supply. This differential reactivity to quinine and electric shock has implications concerning hypothalamic finickiness which are discussed. (24 ref.) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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