Abstract
The present study investigated how much the strategic factor contributes to the differences between the hand-use and the tool-use grasping in motor control. We predicted that even reach-to-grasp movements with a novel tool would show the hand-like aperture profile when the strategic factors were excluded. To test this idea, we employed fast movements to grasp a target, where participants were instructed not to care if they failed to grasp the target object. The results showed that the kinematic profiles of the grasping movements with using the novel tool became similar to that of hand-use grasping as the velocity increased. The present study implies that the shared computation principle is used for motor planning in both hand-use and tool-use grasping, and that the awkwardness-dependent strategy may be driven to prevent the target object from dropping off from the tips of the effectors.
