Grip Force Modulation by Finger Posture

Modulation of grip force has several applications such as sports. We speculated that as mupltiple fingers mechanically interact with each other, it might be possible to adjust grip strength by controlling the movement of single finger. We also speculated that changing grip strength may affect the weight perception of an object on grasping. In this paper, we investigated whether grip strength could be modulated by a specific finger posture, and found that it can be reduced by stretching some fingers, specifically middle finger and ring finger. Preliminary result of weight perception modulation is also reported.