Quantitative control of motivation through sucrose solutions of different concentrations.

Abstract
The experiment demonstrates that quantitative control of motivation can be achieved through control of the concentration of sucrose solutions that are offered to rats as reward. Rats ran down a 6 -ft. runway to a reward consisting of 1 sec. of contact with a sugar solution. Their speed of locomotion was found to be an increasing monotonic function of the concentration of the incentive solution. Also, resistance to extinction of the running habit was found to be directly related to the concentration of sugar solution which had been employed as incentive during the original learning .
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