Measurements of velvet hand illusion by magnitude estimation and paired comparison
The purpose of this study was to measure the level of the Velvet Hand Illusion (VHI) and to propose mechanisms that produce the VHI. The experimental stimuli were instruments with two straight rods positioned parallel to each other. The participant held the two rods between his/her hands and moved both hands simultaneously in the direction orthogonal to the rods. The participants judged the level of the VHI by the methods of magnitude estimation and paired comparison. Both methods gave the highest level of the VHI when the distance between the rods was 100 mm, and the lower level of the VHI when the distance was larger or smaller than 100 mm. In this paper, we described the experiments and presented a simulation model to explain the VHI levels, and we suggested the mechanisms that produce the VHI.