In order to develop skill of students in the physical education, the authors investigated the relation between the intensity of stimulus and the amplitude of evoked potential and how the amplitude is affected by the verbal suggestion of stimulus intensity when the subject is in the hypnotic state.
1. There is an approximately parallel relation among the intensity level (db) of auditory stimulus, the light area of optical stimulus, and the amplitude of evoked potential.
2. When the subject is in the hypnotic state, the amplitude of vertex potential is larger if he is told that the stimulus is loud, and the amplitude is smaller if he is told that the stimulus is small.
3. When the subject is in the hypnotic state, the verbal suggestion that he feels no pain at all produces a big positive change in the amplitude of vertex potential, while the suggestion that he feels very much pain produces a negative change and in some cases, an after-discharge can be observed. But no change was seen in the evoked potential of the central area.
4. When the subject is hypnotized, the amplitude of evoked potential in the occipital area increases and decreases according to the verbal suggestion that the light looks larger and smaller respectively.
Hypnotic suggestion may be applied to the guidane in physical education.