CLINICAL APPLICATION OF THE F-WAVE II. FREQUENCY OF THE F-WAVE
After the observation of F-wave frequency, the following results were obtained. 1. In normal control F-wave frequency of 24-64％ was observed, and no significant difference was recognized between the left and right side. 2. In Parkinson's disease there was observed a significant correlationshipbetween the degree of rigidity and F-wave frequency. In addition, as the objective evaluation method of therapeutic effect F-wave frequency is useful. 3. In cerebrovascular disease irrespective of acute stage or chronic stage, the observation of F-wave is useful for the detection of subclinicallesion and the determination of the recovery process of central nervous system. Especially in the case of complete paralysis the appearance of F-wave coincided with the appearance of associated reaction in the stage. 4. In motor neuron disease it was possible to determine the involvementof upper and lower motor neurones from quite early stage.