[Updated on Apr. 18] Integration of CiNii Articles into CiNii Research

Presenting Tactile Illusion at the Toe Pad using Vibration Stimulus on Toenail: Verifying Force Conditions Inducing Tactile Illusion for First Toe

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  • 足爪振動刺激を用いた足指腹錯触覚提示に関する研究:母指への錯触覚生起における荷重条件の検証

Abstract

<p>We present two psychophysical experiments to quantitatively measure toe force required for inducing a tactile illusion, in which a human feels tactile sensations in the toe pad when a vibration is presented to the toenail while the toe pad is in contact with a surface. While previous literatures introduced the illusion only in the finger pads, we found that the illusion in the toe pad requires a certain level of intensity of vibration and toe force applied to the surface in a preliminary test. In the first experiment, we quantitatively measured the force thresholds for inducing the illusion with constant vibration intensity by method of limits. The results revealed that averages of lower and upper thresholds were 490 and 2370 gf, respectively, and the upper threshold included larger variance than the lower threshold. In the second experiment, we remeasured the lower threshold by method of constant stimuli to eliminate prediction bias. The results revealed that the average threshold was 330 gf positively correlated with the temperature of the toe pad.</p>

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