Gestalt Factors for Velvet Hand Illusion Generation

To realize tactile VR, we are attempting to utilize Velvet Hand Illusion (VHI), so we investigated Gestalt factors including temperature condition. To progress this investigation, we developed a new VHI presentation equipment which possesses two thin brass tubes: one of two was passed cold water and the other was passed warm water. We performed a series of psychophysical experiments using the equipment according to semantic difference method (SD method) and method of limits. As the result of the series of experiments, it is found that when the two tubes were at different temperatures, smooth sensation was decreased by means of decrease of similarity factor, and that sticky and soft sensation were increased by increase of temperature.