MENTAL PROCESS AND CONCOMITANT GALVANIC CHANGES CAUSED WHEN VIBRATIONS OF VARIOUS CYCLES ARE GIVEN TO TEETH

Abstract

The authors, applying GSR (Galvanic Skin Reflex), made experiments on the changes in mental process caused when vibrations of various cycles are given to teeth. Subjects of the experiments included 15 persons who had sound teeth and surrounding tissues GSR was measured with the use of Takei's Polypsychograph. The following results have been obtained in the above experiments.
1) When mental influences caused by unpleasant vibrations were tested through GSR, it was found that vibration of certain frequency was the main cause of disagreeable feeling to the subjects given direct vibration to their teeth just as they feel unpleasant by some sound to their ears.
2) Vibrations of about 700 cycles caused the largest reflex, then those of about 300 and 1, 000 cycles caused next largest reflexes. It was also found that 300 cycles and those in the vicinity of integral multiples of the cycles, the specific frequency of teeth pointed out by Sasaki Group, showed remarkable GSR when direct vibration was given to teeth.