THE INFLUENCE OF MENTAL ACTIVITY ON THE HEIGHT OF THE KNEE-JERK

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Abstract
The knee-jerk was obtained during a normal period and during a period when the subject imagined kicking the foot forward; also during a second normal period and a period when the subject imagined kicking the foot backward. Data from 40 subjects show the height of the knee-jerk to be increased when the subject imagined kicking the foot forward, and decreased when the subject imagined kicking the foot backward. There was no significant difference between the 2 normal periods. These results are probably due to changes in tonus of the muscles involved in the response.

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