The StartReact effect in tasks requiring end-point accuracy
The StartReact effect in tasks requiring end-point accuracy
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DOI：
10.1016/j.clinph.2015.01.028
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发表时间：
2015-10-01
影响因子：
4.7
通讯作者：
Valls-Sole, J.
中科院分区：
文献类型：
--
作者：
Castellote, J. M.;Valls-Sole, J.
目的：快速和准确的运动往往是响应于感觉信号。在反应时间任务中，当令人吃惊的听觉刺激（SAS）与命令信号（IS）一起应用时，开环运动的执行速度加快。在这项研究中，我们研究了SAS上的一个任务，要求accuracy.Methods的性能的影响：9名受试者被要求移动一个监控笔位于一个表中的目标点在一个固定的角距离为30度，从一个起点。目标是一个点的三种可能的直径：5，10，和20毫米。手指的力量，握笔，笔尖对表和运动学变量的前臂运动的压力进行了测量，为三种条件：控制，SAS提供在IS（SAS-IS试验）和在调动期间交付的SAS结果：在运动轨迹和力剖面上可以识别出两个运动阶段。第一阶段，弹道，在SAS-MOV试验中显着缩短，与对照试验相比，具有更早和更大的峰值速度和峰值力。第二阶段，缓慢接近目标，在SAS-IS试验中更长，但在SAS-MOV试验中没有。在所有条件和刺激models.Conclusions：一个SAS的速度只有第一（弹道）部分的运动中的准确性任务保持准确性。较慢的目标接近补偿了加速的初始运动。在运动开始后，当SAS被传递时，运动的最后部分没有变化。意义：StartReact效应仅限于复杂运动的开始，当肌肉在弹道模式下被激活时，没有反馈。(C)2015年国际临床神经生理学联合会。由Elsevier爱尔兰有限公司出版。保留所有权利。
Objective: Fast and accurate movements are often performed in response to a sensory signal. In reaction time tasks, execution of open loop movements is speeded up when a startling auditory stimulus (SAS) is applied together with the imperative signal (IS). In this study, we examined the effects of a SAS on the performance of a task that demands accuracy.Methods: Nine subjects were asked to move a monitored pen to a target point located in a table at a fixed angular distance of 30 degrees from a start point. The target was a spot of three possible diameters: 5, 10, and 20 mm. Finger force for pen holding, pen tip pressure against the table and kinematic variables of the forearm movement were measured for three conditions: control, SAS delivered at IS (SAS-IS trials) and SAS delivered during movement execution (SAS-MOV trials).Results: Two movement phases could be identified in the movement trajectory and force profile. The first phase, ballistic, was significantly shortened in SAS-MOV trials, with earlier and larger peak velocity and peak force with respect to control trials. The second phase, slow approach to target, was longer in SAS-IS trials but not in SAS- MOV trials. Accuracy was maintained throughout all conditions and stimulation modes.Conclusions: A SAS speeds up only the first (ballistic) part of the movement in an accuracy task. Slower target approach compensates for the accelerated initial movement. No changes in the last part of the movement are seen when a SAS is delivered after movement onset.Significance: The StartReact effect is restricted to the onset of a complex movement, when muscles are activated in a ballistic mode, without feedback. (C) 2015 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.