ベルベットハンドイリュージョンを生起する2本の平行線の刺激条件について

抄録

Tactile VR (i.e. Haptics) that enables presentation of texture sensation is expected to be applied in medical and engineering fields. Several commodities are already developed in visual and auditory VR, while haptics has not been progressed due to the difficulty of developing a presentation device to generate texture feeling on skin. Therefore, in this research, we focus on the tactile illusion phenomenon (Velvet Hand Illusion; VHI) as a method of presenting the texture sensation to progress haptics. In VHI, we can feel the smooth sensation between hands when we sandwich the two parallel stretched wires which move back and forth between hands. We can also feel VHI by a dot-matrix display which is equipped with two refreshable braille displays. We conducted two series of psychophysical experiments to clarify the stimulation conditions to generate VHI with the dot-matrix display. First, we identified that VHI hardly occurred when the interval between stimulus pins forming lines was closer than a two-point threshold. Second, it was clarified that the line sensation is an essential condition for VHI and that a line length of 29 mm is the absolute threshold of VHI.