The influence of an increase in muscular tension on mental efficiency.

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Abstract
It was the purpose of these experiments to compare the time required to solve short arithmetical problems under normal conditions and the time required to solve the same problems when the subject exerted a pressure between 25 and 40 pounds with his right foot on a pedal apparatus. 18 university students, 6 men and 12 women, were used as subjects. Each subject solved each problem under two conditions, half of them doing a problem first under tension and later under normal conditions and the other half doing the problem first under normal conditions and later under tension. "The most general conclusion which seems justified by all of the results of our experiment is that increasing the tension of the right leg does not in itself definitely increase the efficiency of solving arithmetical problems." (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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