Albino rats were given acquisition training on a 6 ft. enclosed straight alley runway which could be adjusted for inclinations of 0°, 20°, and 40°. After receiving equal training on each of the three effort conditions, three groups of subjects were given massed extinction trials for 30 min. on only one effort condition. Results indicated fewer responses during extinction under the greater effort conditions. These results support a relation between effort and response decrement in extinction, consistent with the predictions of Hull's theory of reactive inhibition.
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