Center for Human Movement Sciences, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
Hum Mov Sci. 2010 Aug;29(4):518-28. doi: 10.1016/j.humov.2010.02.010. Epub 2010 Jun 2.
Both in the catching and grasping component of prehension, the hand opens and closes before hand-object contact is made. The initiation of hand closure has to be coordinated with the time course of the decrease of the distance between the hand and the target object, i.e., with the reaching component in prehension or the approach of the target in catching. The authors investigated if this initiation of hand closure could be explained by a common control. For this purpose, they fitted the dynamic timing model to data from the two tasks. In both tasks, participants were asked to get hold of an object approaching along the table top at a constant velocity. In the prehension task, participants could reach out to grasp the object; in the catching task, they were required to keep their hand stationary. In comparison with other accounts, the dynamic timing model performed best in explaining the data. The model proved adequate for the prehension task but not for the current catching task.
在抓握的抓握和抓取组件中，手在接触手对象之前打开和关闭。手闭合的开始必须与手和目标物体之间的距离减小的时间进程相协调，即与抓握中的到达组件或目标的接近相协调。作者研究了这种手闭合的开始是否可以通过共同的控制来解释。为此，他们将动态定时模型拟合到来自两个任务的数据中。在两个任务中，参与者都被要求以恒定的速度从桌子顶部拿到一个接近的物体。在抓握任务中，参与者可以伸出手去抓住物体；在捕捉任务中，他们需要保持手不动。与其他解释相比，动态定时模型在解释数据方面表现最好。该模型适用于抓握任务，但不适用于当前的捕捉任务。
