Prediction of the Comparative Reinforcement Values of Running and Drinking

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Science  15 Mar 1963:
Vol. 139, Issue 3559, pp. 1062-1063
DOI: 10.1126/science.139.3559.1062


The probability of free drinking and running in rats was controlled by sucrose concentration and force requirements on an activity wheel. Drinking and running were then made contingent on pressing a bar. Barpressing increased monotonically with the associated response probability, and equally for drinking and running. The results support the assumption that different responses of equal probability have equal reinforcement value.