Department of Experimental Psychology, Ludwig-Maximilians-Universität München, Leopoldstr. 13, 80802 München, Germany.
Exp Brain Res. 2010 Feb;201(1):93-109. doi: 10.1007/s00221-009-2070-4.
It has been observed that grip opening is delayed when participants are asked to execute complex grasping movements, such as passing over an obstacle or a via-position (Haggard and Wing 1998; Alberts et al. 2002). This finding was proposed to indicate a shift toward sequential performance, meaning that complex movements are carried out in independent motor steps. In our experiments we investigated which aspects of a grasping task determine whether a movement is executed holistically or sequentially. Therefore, participants had to perform different types of curved movements in order to reach and grasp a target object. When only the complexity of the transport paths was varied, no indication of sequential movement execution was found. However, when participants additionally had to either stop at, or pass over a certain via-position the pre-shaping pattern changed considerably indicating a movement segmentation effect. This effect became stronger with increasing difficulty of the sub-task, suggesting that attentional factors are involved.
研究发现，当参与者被要求执行复杂的抓握动作，如越过障碍物或通过位置（Haggard 和 Wing 1998；Alberts 等人，2002）时，抓握开口会延迟。这一发现表明了向顺序性能的转变，即复杂的运动是通过独立的运动步骤进行的。在我们的实验中，我们研究了抓握任务的哪些方面决定了运动是整体执行还是顺序执行。因此，参与者必须执行不同类型的弯曲运动才能到达并抓住目标物体。当仅改变运输路径的复杂性时，没有发现顺序运动执行的迹象。然而，当参与者还必须在某个通过位置停止或通过时，预成型模式会发生很大变化，表明运动分割效应。随着子任务难度的增加，这种效应变得更强，这表明注意力因素参与其中。
