Fractional Escape and Avoidance on a Titration Schedule

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Science  19 Dec 1958:
Vol. 128, Issue 3338, pp. 1575-1576
DOI: 10.1126/science.128.3338.1575


Rats were shocked, continuously or intermittently, by an electrical stimulus whose intensity increased by one step every 20 seconds. Each time the rat depressed a lever in the experimental chamber, shock intensity was decreased by one step. Lever-pressing was maintained on such a program, with both continuous and intermittent delivery of shock.