Stop Before You Leap: Changing Eye and Hand Movements Requires Stopping
Stop Before You Leap: Changing Eye and Hand Movements Requires Stopping
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DOI：
10.1037/a0033049
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发表时间：
2013-08-01
影响因子：
2.1
通讯作者：
Logan, Gordon D.
中科院分区：
文献类型：
--
作者：
Bissett, Patrick G.;Logan, Gordon D.
搜索步骤范式解决了改变运动计划（通常是扫视眼球运动）所涉及的过程。受试者将他们的眼睛移动到干扰物中的目标（T1），但是当目标移动到新位置（T2）时，受试者被指示将他们的眼睛直接从固定移动到新位置。我们询问移动到 T2 是否需要一个单独的停止过程来阻止移动到 T1。不需要。第二响应的移动计划可能会抑制第一响应。为了区分这些假设，我们将 T1 的偏移量与 T2 的起始点解耦。如果第二个运动足以抑制第一个运动，那么对 T1 做出反应的概率应仅取决于 T2 的开始。如果需要单独的停止过程，则响应 T1 的概率应仅取决于 T1 偏移量，该偏移量充当停止信号。我们在手动和扫视搜索步骤任务中测试了这些假设，发现对 T1 做出响应的概率很大程度上取决于 T1 偏移量，这支持了以下假设：从一个运动计划更改为另一个运动计划涉及抑制第一个计划的单独停止过程。
The search-step paradigm addresses the processes involved in changing movement plans, usually saccadic eye-movements. Subjects move their eyes to a target (T1) among distractors, but when the target steps to a new location (T2), subjects are instructed to move their eyes directly from fixation to the new location. We ask whether moving to T2 requires a separate stop process that inhibits the movement to T1. It need not. The movement plan for the second response may inhibit the first response. To distinguish these hypotheses, we decoupled the offset of T1 from the onset of T2. If the second movement is sufficient to inhibit the first, then the probability of responding to T1 should depend only on T2 onset. If a separate stop process is required, then the probability of responding to T1 should depend only on T1 offset, which acts as a stop signal. We tested these hypotheses in manual and saccadic search-step tasks and found that the probability of responding to T1 depended most strongly on T1 offset, supporting the hypothesis that changing from one movement plan to another involves a separate stop process that inhibits the first plan.