Abstract
It is obvious that the human's arm and the shift are not mechanically and strongly connected. We grasp the shift knob by the compliant finger and through the soft skin. In this condition, the phase difference between the motion of arm and that of shift results from the move-allowance of the knob in the palm. By observing the palm over the transparent knob by using high speed camera, it has found that the skin rapidly deforms. In this study, it is hypothesized that the horizontal stretch of skin enhances the perception of the undulation.
