Threshold curves and equal-sensation contours for low frequency vibrotactile stimuli on the human glabrous skin

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Using vibrotactile stimuli, threshold curves and equal-sensation contours were determined on the glabrous skin of four adult human subjects. Threshold curves were measured between 1 Hz and 50 Hz. When plotted on log-log coordinates, their values decreased linearly at 1-16 Hz, became constant at about 16-30 Hz, and decreased again at 35-50 Hz. Equal-sensation contours were measured between 1 Hz and 16 Hz. They decreased monotonously as a function of frequency and curved downward particularly concavely when the standard stimulus amplitude was greater. Therefore, at the stimulus range of 1-16 Hz, threshold curves were more or less linear, but equal-sensation contours were curved downward concavely especially at large standard stimuli. This discrepancy seemed to be caused by the difference in mechanoreceptive unit types which took part in subjective responses. It would seem that suprathreshold sensation depends on several types of units, whereas vibrotactile thresholds depend mainly on the rapidly adapting unit.
公益社団法人日本心理学会の論文