音刺激による無条件皮膚電気反応(nonconditioncd GSR) とその聴力測定への応用

抄録

The appearance of nonconditioned GSR to pure tone stimuli and its evaluation to the practical application in objective audiometry was studied. Endosomatic method was used for measuring the GSR, and all responses were recorded graphically.
The results were as follows.:
1. Galvanic adaptation to repeated pure tone stimuli took place rapidly.
a) As auditory stimuli, 1000cps pure tone at 80db were presented. Among three groups of which time interval of stimuli were 20sec., 40sec., and 1 minut. respectively, it seemed that galvanic adaptation tended to appear more slowly as time interval became longer, however, there was no statistically significant correlation.
b) As auditory stimuli, 1000cps pure tone were presented at 20sec. interval of stimuls. Among four groups of which intensity of stimuli were 10-20db, 30-40db, 50-60db and 80db respectively, a relationship was not established between the rapidity of galvanic adaptation and the intensity of stimuli.
2. Nonconditioned GSR to pure tones was very unstable and different individually, however, if a subject concentrated his attention on the test tone, his GSR became stable, and its threshold value obtained with GSR was markedly lowered.
Subjects were previously instructed to count the number of times that he could hear test tone, in order to concentrate his attentation on test stimuli.
3. Threshold determination with GSR audiometry were performed on 71 subjects by means of the method mentioned above.
As test tones, 500cps, 1000cps, 2000cps, and 4000 cps pure tones were used in 10db step ascending method. GSR andiometry proved possible for 59 cases out of 71 subjects, and 90% of the threshold value of obtained with GSR audiometry was distributed within ±10db with those obtained in standard audiometry.
4. This audiometric method was difficult to apply in the measurement of hearing acuity of young children under 4 years of age.