Research Institute MOVE, Faculty of Human Movement Sciences, VU University, Van der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands.
Exp Brain Res. 2010 Sep;206(1):15-24. doi: 10.1007/s00221-010-2382-4. Epub 2010 Sep 7.
We examined whether the movement path is considered when selecting the positions at which the digits will contact the object's surface (grasping points). Subjects grasped objects of different heights but with the same radius at various locations on a table. At some locations, one digit crossed to the side of the object opposite of where it started. In doing so, it moved over a short object whereas it curved around a tall object. This resulted in very different paths for different objects. Importantly, the selection of grasping points was unaffected. That subjects do not appear to consider the path when selecting grasping points suggests that the grasping points are selected before planning the movements towards those points.
我们研究了在选择手指将要接触物体表面的位置(抓取点)时,是否会考虑运动路径。实验中,被试在桌子上的不同位置抓取不同高度但半径相同的物体。在某些位置,一根手指会交叉到与起始位置相对的物体的一侧。在这个过程中,它在一个矮物体上移动,而在一个高物体上则弯曲。这导致不同物体的路径非常不同。重要的是,抓取点的选择不受影响。被试在选择抓取点时似乎没有考虑路径,这表明抓取点是在规划朝向这些点的运动之前选择的。