皮膚の振動感覚について
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概要
- 論文の詳細を見る
The threshold values, the amplitude discrimination and the frequency discrimination of the vibratory sensation of the skin was measured by a moving coil type vibrator with a BaTiO_3 ceramic element. The frequencies ranged from 50 to 1000 cps. The amplitude was obtained from the output voltage of BaTiO_3 ceramic. The contact area of the vibrator with the skin was about 0. 7 cm^2. The threshold of vibration sensation of the skin was measured with several normal persons. The threshold amplitude was 10^<-2>mm at 60 cps, about 10^<-4>mm at 400 cps, and about 10^<-3>mm at 1000 cps. These thresholds changed only slightly with person (about ±5db), with parts of body where they were measured (about ±10 db), and with the constant pressure on the vibrator (about 2 db) which was usually about 100g weight. The threshold values of the acceleration were about 6x10^2mm per sec^2 and remained almost constant over the lower frequencies below ca. 300 cps. In the higher frequencies above about 300 cps the threshold value rised up about 20 db per octave. The amplitude discrimination of vibratory sensation of the skin at same frequency was measured by a vibrator which was able to produce two different amplitudes alternatively. Generally, the limit of the amplitude discrimination was about 2 db. The frequency discrimination of the vibratory sensation of the skin at the same amplitude was measured by a vibrator which could produce two sorts of frequencies alternatively. Generally, the limit of frequency discrimination is about 7%. The frequency discrimination under two different amplitudes was nearly the same as that obtained under two equal amplitudes. During the experiments of discrimination, the ears were masked by noise. These results of discrimination also show a little difference by persons, the parts of the body, the amplitude of vibration, and the frequency. Thus, as to the vibratory sensation of the skin it is concluded that one can obtain the amplitude discrimination and the frequency discrimination independently.
- 社団法人日本音響学会の論文
- 1955-09-30