The effect of changed visual feedback on intention tremor in multiple sclerosis
The effect of changed visual feedback on intention tremor in multiple sclerosis
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DOI：
10.1016/j.neulet.2005.10.010
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发表时间：
2006-02-06
影响因子：
2.5
通讯作者：
Liu, XG
中科院分区：
文献类型：
--
作者：
Feys, P;Helsen, W;Liu, XG
在多发性硬化症(MS)患者中，与记忆引导的运动任务相比，视觉引导下的意图震颤幅度更大。在本研究中，研究了视觉反馈在视觉引导的腕部步态跟踪任务中对意向震颤的影响。具体地说，手部的视觉反馈是即时提供的，或者是在不同的时间窗口内平均提供的。13名有意向性震颤的多发性硬化症患者和14名健康对照完成了手腕步进跟踪任务，同时即时显示实际手位置的视觉表示，或在150、250和350ms的时间窗口中平均显示。在患者组中已经发现，随着初始误差的减少和屏幕上震颤幅度的降低，当视觉反馈改变时，实际执行的震颤的幅度也会降低。虽然时间窗越大，呈现手部位置视觉反馈的延迟就越大，但震颤的减少在有操纵反馈的情况下没有区别。总体震颤幅度的降低不太可能与其他因素有关，如眼睛注视缺陷或主要手运动的速度。这些结果表明，手部震颤的严重程度取决于位置和运动误差的视觉反馈。(C)2005爱思唯尔爱尔兰有限公司。保留所有权利。
In patients with multiple sclerosis (MS), intention tremor amplitude is enhanced during the visually guided compared to the memory guided motor tasks. In the present study, the effect of visual feedback on intention tremor was investigated during visually guided wrist step-tracking tasks. Specifically, visual feedback of the hand was provided either instantly or averaged over different time windows. Thirteen MS patients with intention tremor and 14 healthy controls performed the wrist step-tracking task, while the visual representation of the actual hand position was displayed instantly or averaged over time windows of 150, 250 and 350 ms. It has been found in the patient group that, in association with a decreased initial error and decreased tremor amplitude on the screen, the amplitude of the actual performed tremor also decreased when visual feedback was changed. The tremor reduction was not different between conditions with manipulated feedback, although delays in presenting visual feedback of the hand position increased when the time window was larger. The reduction in overall tremor amplitude was unlikely related to other factors, such as eye fixation deficits or the speed of the primary hand movement. These results suggest that hand tremor severity is dependent on the visual feedback of position and movement errors. (c) 2005 Elsevier Ireland Ltd. All rights reserved.