Abstract
Six cats were stimulated via chronically implanted diencephalic electrodes during performance of a learned bar-pressing response for food reward. Three areas were involved: the nucleus ventromedialis and the centrum medianum of the thalamus, and the posterior hypothalamus. The stimulation resulted in a statistically significant slower rate of responding as compared to control non-stimulation trials. Implications of the results with respect to neuropsy-chological theory are discussed.

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