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Electrophysiological studies of the effect of rhythmical sound on the central nervous system 1

, : Electrophysiological studies of the effect of rhythmical sound on the central nervous system 1. Journal of the Kansai Medical University 36(4): 656-689

Electrophysiological studies were conducted in rabbits to investigate the effect of rhythmical sound with 120/min beating frequency and 500 Hz pitch, 120/min .cntdot. 1000 Hz, 220/min .cntdot. 500 Hz and 450/min .cntdot. 1000 Hz, respectively, on CNS. The threshold of arousal reaction evoked by the reticular formation (RF) stimulation was elevated with the sounds of 120/min .cntdot. 500 Hz from the level when the non-sound was given. With the sounds of 220/min .cntdot. 500 Hz, 120/min .cntdot. 1000 Hz and 450/min .cntdot. 1000 Hz, the threshold of arousal reaction dropped compared to the condition of non-sound. The threshold of muscular discharges evoked by the RF stimulation were lowered with each of the 4 sounds compared to the condition of non-sound. The muscular discharges evoked by the stimulation on cerebral cortex were inhibited with the sound of 120/min .cntdot. 500 Hz, compared to the condition of non-sound, but were facilitated with 450/min .cntdot. 1000 Hz. The muscular discharges evoked by the stimulation on hippocampus were facilitated with both of 120/min .cntdot. 500 Hz and 450/min .cntdot. 1000 Hz. The effects on the nociceptive reflex of the sounds of 120/min .cntdot. 500 Hz, 220/min .cntdot. 500 Hz and 450/min .cntdot. 1000 Hz were all facilitated compared to the condition of non-sound. The effect of the non-sound was inhibitory on the M-H wave, whereas that of the sounds of 120/min .cntdot. 500 Hz and 450/min .cntdot. 1000 Hz were facilitating. The rhythmical sound with a low frequency, low pitch showed an inhibitory effect to the consciousness and the function of pyramidal system. The rhythmical sound with a high frequency, high pitch showed an facilitating effect. The rhythmical sound had a facilitating effect on the spinal reflex regardless of its frequency and pitch.

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