Effect of skin temperature on vibrotactile sensitivity |
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Authors: | H Ide H Akimura S Obata |
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Institution: | (1) College of Science & Engineering, Aoyama Gakuin University, 6-16-1 Chitosedai, Setagaya-ku, 157 Tokyo, Japan |
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Abstract: | The vibration problems relating to living bodies have so far been studied from the perspectives of engineering physiology
and psychology. This study shows the relationship between vibratory sensibility and temperature in the living body. Psychological
experiments were carried out by using the vibrometer of an acoustic calibration apparatus in sine, triangular and square waves.
The sensibility-threshold measurements were made using 30–700 Hz sine waves, 30–300 Hz triangular and sawtooth waves, or 30–250
Hz square waves. Each of ten subjects was kept seated. The average value of the vibratory levels, varied by ascending and
descending steps, was taken as that of the threshold. As the vibrometer in the apparatus used makes a noise at frequencies
greater than 250 Hz it was masked from the subject by presenting him with a different noise. The threshold curve for square
waves is lower by 12·3 dB than that for sine waves at about 30Hz. The threshold curve of the 26°C sine wave was lower by 10
dB than that of the 58°C sine wave vibration near 200 Hz. For example with a sine wave, at 58°C the amplitude threshold was
lowest at about 270 Hz, but at −11°C at about 200 Hz. At frequency stimulation higher than 120 Hz, as the temperature of the
contact point was lowered, the amplitude threshold increased and the frequency at which the threshold curve was at a minimum
shifted to a lower frequency. |
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Keywords: | Skin temperature Vibrotactile |
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