A preliminary mapping of electrical reinforcing effects in the rat brain.

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Abstract
Chronic implantations of electrodes in various parts of the rat brain were followed by behavioral tests of the reinforcing effects of self-stimulation by means of a bar-pressing response. Histological reconstruction showed that reinforcing effects were secured from electrodes located in the septal area, the amygdaloid complex and the anterior hypothalamus. Moderate reinforcing effects were also noted in animals with electrodes in the cingulate cortex, the hippocampus, the posterior hypothalamus and the anterior thalamus. Other areas gave either low operant levels (netural reinforcing properties) or low response rates (negative reinforcement). The latter areas were the medial lemniscus, the zona incerta and parts of the tegmentum behind the medial geniculate.

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