Flanagan J R, Tresilian J, Wing A M
MRC Applied Psychology Unit, Cambridge, UK.
Neurosci Lett. 1993 Apr 2;152(1-2):53-6. doi: 10.1016/0304-3940(93)90481-y.
Numerous studies have investigated the kinematics of arm movements; others have examined grip forces during static holding of objects. However, the coordination of grip force and arm movement when moving grasped objects has not been documented. We show that grip force is finely modulated in phase with load force during movements with grasped objects in which load force varies with acceleration. A tight coupling between grip and load force is seen in point-to-point and cyclic movements of varying rate and direction. We conclude that in transporting an object, the programming of grip force is part and parcel of the process of planning the arm movement.
众多研究调查了手臂运动的运动学；其他研究则考察了静态握持物体时的握力。然而，在移动被抓握物体时握力与手臂运动的协调性尚未见报道。我们发现，在移动被抓握物体的过程中，当负载力随加速度变化时，握力会与负载力同相位地进行精细调节。在不同速率和方向的点对点及循环运动中，握力与负载力之间存在紧密耦合。我们得出结论，在搬运物体时，握力的规划是手臂运动规划过程的重要组成部分。
