Timmann D, Stelmach G E, Bloedel J R
Motor Control Laboratory, Arizona State University, Tempe 85287-0404, USA.
Neurosci Lett. 1996 Mar 29;207(2):133-6. doi: 10.1016/0304-3940(96)12510-6.
The kinematic changes of the manipulation and transport components during a prehensile movement were examined in an experimental condition that required alterations during the manipulation phase. Subjects started with a normal finger posture but were required to briefly open and close their thumb and index finger while transporting the wrist to grasp the object. The changes in the aperture altered most of the kinematic landmarks of the wrist. There was considerable slowing of most kinematic characteristics for the wrist transport, and the velocity profile of the wrist showed two peaks. The time of occurrence of the first peak was poorly correlated with the time of the first maximal finger aperture (before the brief finger touch). In contrast, the second wrist velocity peak was highly correlated with the time to the second maximal finger aperture (just before the grasp of the object). Thus, as the reach progressed and the object to be grasped was approached, the temporal relationship between the wrist and aperture components of the movement became more temporally related.
在一个需要在操作阶段进行改变的实验条件下，研究了抓握运动中操作和运输部分的运动学变化。受试者起始手指姿势正常，但在手腕运输以抓取物体时，需要短暂地张开和闭合拇指与食指。孔径的变化改变了手腕的大部分运动学标志点。手腕运输的大多数运动学特征都有明显减慢，并且手腕的速度曲线显示出两个峰值。第一个峰值出现的时间与第一个最大手指孔径（在短暂手指触碰之前）的时间相关性很差。相比之下，第二个手腕速度峰值与第二个最大手指孔径（就在抓住物体之前）的时间高度相关。因此，随着伸手动作的进行以及接近要抓取的物体，运动中手腕和孔径部分之间的时间关系在时间上变得更加相关。
