Progressive Ratio as a Measure of Reward Strength

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Science  29 Sep 1961:
Vol. 134, Issue 3483, pp. 943-944
DOI: 10.1126/science.134.3483.943


Four rats were trained to press a lever on a ratio schedule of reinforcement in which the number of lever presses required on each consecutive run increased by a fixed increment. Both concentration and volume of the reward were varied. Relationships were obtained between reward and deprivation variables and the size of the final completed ratio run.