SPIDARを用いたsize-weight illusionの検証(<特集>「手」と脳とVR空間)

抄録

The aim of this paper is to examine how the humans perceive the object weight related to size-weight link. A size-weight illusion was used to investigate the role of visual and haptic cues in producing of adapted force during holding objects. Flanagan et. al. reported that the size weight illusion is caused by independence of perceptual and sensorimotor predictions in the current paper. We used a string-based haptic interface 'SPIDAR' to build the size-weight illusion environments and measured the hand displacement as a parameter to represent the subject's expected weight during holding task. As a result, we found that the size-weight illusion disappeared when the differences between the peak values of the dropped hand positions of two objects vanished. This results indicates that this phenomenon comes from the mismatch between the expected weight and actual sensory feedback related to object weight.