Abstract
Rats were trained to press one lever on a variable interval schedule of reinforcement in order to produce a second lever. Each response on the’ second lever produced a single burst of hypothalamic electrical stimulation, and following a fixed number of bursts the second lever was retracted. After stabilization of responding, fear conditioning was superimposed on the leverpressing situation. All of the rats developed complete suppression of responding within a few trials. The schedule of reinforcement then was systematically manipulated to increase either the density or the intensity of reinforcement by increasing the frequency with which the second lever was made available, increasing the number of reinforced responses allowed on the second lever, or increasing the intensity of the brain stimulation. Following each such manipulation, there was a temporary attenuation of suppression followed by the reappearance of suppression.
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