Department of Psychology, Centre for Brain and Mind, University of Western Ontario, London, ON, N6A 5C2, Canada.
Exp Brain Res. 2010 May;202(3):623-32. doi: 10.1007/s00221-010-2169-7. Epub 2010 Feb 5.
Previous research has suggested that the visuomotor system possesses an "automatic pilot" which allows people to make rapid online movement corrections in response to sudden changes in target position. Importantly, the automatic pilot has been shown to operate in the absence of visual awareness, and even under circumstances in which people are explicitly asked not to correct their ongoing movement. In the current study, we investigated the extent to which the automatic pilot could be "disengaged" by explicitly instructing participants to ignore the target jump (i.e., "NO-GO"), by manipulating the order in which the two tasks were completed (i.e., either "GO" or NO-GO first), and by manipulating the proportion of trials in which the target jumped. The results indicated that participants made fewer corrections in response to the target jump when they were asked not to correct their movement (i.e., NO-GO), and when they completed the NO-GO task prior to the task in which they were asked to correct their movement when the target jumped (i.e., the GO task). However, increasing the proportion of jumping targets had only a minimal influence on performance. Critically, participants still made a significant number of unintended corrections (i.e., errors) in the NO-GO tasks, even under explicit instructions not to correct their movement if the target jumped. Overall these data suggest that, while the automatic pilot can be influenced to some degree by top-down strategies and previous experience, the pre-potent response to correct an ongoing movement cannot be completely disengaged.
先前的研究表明，运动视觉系统具有一种“自动驾驶仪”，它可以让人们在目标位置突然发生变化时快速进行在线运动修正。重要的是，已经证明自动驾驶仪在没有视觉意识的情况下运作，甚至在人们被明确要求不纠正正在进行的运动的情况下也是如此。在当前的研究中，我们通过明确指示参与者忽略目标跳跃（即“不做”）、通过操纵完成两项任务的顺序（即先进行“做”或“不做”）以及通过操纵目标跳跃的试验比例，来研究自动驾驶仪在多大程度上可以“脱离”。结果表明，当参与者被要求不纠正他们的动作（即“不做”），以及当他们先完成不做任务然后再完成要求他们在目标跳跃时纠正动作的任务（即“做”任务）时，他们对目标跳跃的反应会做出更少的修正。然而，增加跳跃目标的比例对性能的影响很小。至关重要的是，即使在明确指示如果目标跳跃则不要纠正运动的情况下，参与者在不做任务中仍然会做出大量非预期的修正（即错误）。总体而言，这些数据表明，虽然自动驾驶仪可以在一定程度上受到自上而下的策略和先前经验的影响，但纠正正在进行的运动的前置反应不能完全脱离。
