Abstract
A consistency in the effects of food deprivation and amphetamine administration on both gross locomotor activity and electrical self-stimulation of the brain (ESSB) is noted. The effects of sensory conditions on ESSB were investigated. Rats were trained to press a bar for rewarding brain stimulation. When Ss had stabilized, they were tested in a complete factorial design composed of four levels of illumination and two levels of noise. It was found that Ss pressed more under the medium illumination condition than under any other level of illumination, while white noise had no significant effects. Since rats are more active in the dark than in the light, it is concluded that illumination has unlike effects on activity and rate of ESSB.
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