A positive reinforcing effect of electrical stimulation.

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Abstract
"Four groups of hooded rats were given 0, 1.2, 4, and 12 V. of electrical stimulation contingent upon bar pressing in a Skinner box following prior operant tests and training for light reinforcement. Electric shock was found to have positive reinforcing effects which were a positively accelerated function of intensity at least up to threshold." (PsycINFO Database Record (c) 2006 APA, all rights reserved)