Liesker Hanneke, Smeets Jeroen B J, Brenner Eli
Faculty of Human Movement Sciences, Vrije Universiteit, Van der Boechorststraat 9, 1081 BT Amsterdam, The Netherlands.
Acta Psychol (Amst). 2008 Feb;127(2):398-406. doi: 10.1016/j.actpsy.2007.07.008. Epub 2007 Sep 11.
When searching for a target with eye movements, saccades are planned and initiated while the visual information is still being processed. If hand movements are needed to perform a search task, can they too be planned while visual information from the current position is still being processed? To find out we studied a visual search task in which participants had to move their hand to shift a window through which they could see the items. The task was to find an O in a circle of Cs. The size of the window and the sizes of the gaps in the Cs were varied. Participants made fast, smooth arm movements between items and adjusted their movements, when on the items, to the window size. On many trials the window passed the target and returned, indicating that the next movement had been planned before identifying the item that was in view.
在通过眼动搜索目标时，扫视动作是在视觉信息仍在处理时就被计划和启动的。如果执行搜索任务需要手部动作，那么在当前位置的视觉信息仍在处理时，手部动作也能被计划吗？为了找到答案，我们研究了一项视觉搜索任务，在该任务中，参与者必须移动他们的手来移动一个窗口，通过这个窗口他们可以看到物品。任务是在一圈字母C中找到一个字母O。窗口的大小以及字母C中的间隙大小是变化的。参与者在物品之间进行快速、平稳的手臂移动，并在接触到物品时，根据窗口大小调整他们的动作。在许多试验中，窗口越过目标并返回，这表明在下一个动作被计划之前，还没有识别出视野中的物品。
