Abstract
Albino rats were trained to respond on a multiple variable-interval (VI) shock-avoidance schedule, where VI responses were reinforced on one bar, and shock-avoidance responses were reinforced on another in alternating components. Tone-shock pairs were superimposed upon the VI components, and conditioned suppression was obtained. These results are in opposition to those obtained when stimulus-shock pairs are superimposed upon baselines in Ss with shock-avoidance histories where a single manipulandum has been used for both schedules.
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