Brenner E, Smeets J B
Vakgroep Fysiologie, Erasmus Universiteit, Rotterdam, The Netherlands.
Exp Brain Res. 1995;105(2):318-20. doi: 10.1007/BF00240968.
It has previously been shown that, when subjects are instructed to move their finger slowly from one point to another the finger follows a path that deviates systematically from a straight line connecting the two points. The deviation depends on the angle between this fictive line and a line connecting the subject's finger with his body. In the present study, we examined whether the deviation also depends on the target's orientation. In two experiments, subjects were instructed to move a finger slowly towards five targets. We recorded the finger's movements. In one experiment, the targets were aligned. In the other, they were oriented radially around the starting point. Otherwise, conditions were the same. The difference in target orientation influenced the finger's path. Most importantly, when the targets were oriented radially around the starting point, the finger's path was straight. We conclude that pointing is more than moving the finger to a specified position.
先前的研究表明，当受试者被指示将手指从一个点缓慢移动到另一个点时，手指所经过的路径会系统地偏离连接这两点的直线。这种偏差取决于这条虚拟直线与连接受试者手指和身体的直线之间的夹角。在本研究中，我们考察了这种偏差是否也取决于目标的方向。在两个实验中，受试者被指示将一根手指缓慢移向五个目标。我们记录了手指的运动。在一个实验中，目标是对齐的。在另一个实验中，它们围绕起点呈放射状排列。除此之外，条件是相同的。目标方向的差异影响了手指的路径。最重要的是，当目标围绕起点呈放射状排列时，手指的路径是直的。我们得出结论，指向不仅仅是将手指移动到指定位置。
