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Science. 1961 Sep 29;134(3483):943-4.

Progressive ratio as a measure of reward strength.

Abstract

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.

PMID:
13714876
DOI:
10.1126/science.134.3483.943
[Indexed for MEDLINE]

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