Abstract
Abstract Three cats implanted with subcutaneous shock electrodes in both flanks were required to press a lever to reduce slightly the intensity of a continuously present and gradually increasing electric shock. Whenever one unilateral electrode site was anesthetized with procaine, cats tolerated there the maximum shock available (5 ma) for one-half hr post-injection, with some return of sensation by 100 min, and restoration of normal shock-tolerance levels by at least 400 min. By contrast, on intervening tests, titration performance was enhanced and aversive thresholds apparently reduced for shocks applied to the opposite side of the cat's body. The latter result is difficult to attribute to the pharmacologic activity of the procaine and may represent an example of drug-induced behavioral contrast.
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