Abstract
The effects of food deprivation on hypothalamic self-stimulation in guinea pigs were investigated in a free-operant shuttle-box situation which provides a rate-independent index of reward and an index of aversion. Food deprivation produced anatomically specific reward-modulation effects that were clearly dissociable from general activation or debilitation. All of the posterior electrodes showed increased reward and all of the anterior electrodes showed decreased reward. In contrast, food deprivation generally exerted very little effect on the aversive component of ICS.
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