THE TETANIC NATURE OF THE KNEE-JERK RESPONSE IN MAN

Abstract
Records of action currents from the rectus femoris muscle give indications of periodic neural discharges during the knee-jerk response proper. Periodic groupings of the oscillations, which have been termed "envelopes," occur at the rate of 10-20 per sec. Action currents during the knee-jerk were strikingly similar to those obtained during voluntary contraction.

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