Decrease in prefrontal hemoglobin oxygenation during reaching tasks with delayed visual feedback: a near-infrared spectroscopy study
Decrease in prefrontal hemoglobin oxygenation during reaching tasks with delayed visual feedback: a near-infrared spectroscopy study
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DOI：
10.1016/j.cogbrainres.2004.04.004
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发表时间：
2004-08-01
期刊：
影响因子：
--
通讯作者：
Oda, I
中科院分区：
文献类型：
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作者：
Shimada, S;Hiraki, K;Oda, I
手部运动的视觉反馈对于准确到达至关重要。虽然以前的研究已经广泛地研究了视觉反馈的空间改变（例如，棱镜适应），视觉反馈的时间延迟较少探索。在本研究中，我们探讨了延迟视觉反馈的影响，移动的手在达到任务。采用近红外光谱仪（NIRS）测量前额叶皮层活动。12名受试者在两种条件下进行到达任务，其中他们自己的手的视觉反馈延迟200 ms（延迟条件）或0 ms（正常条件）。视觉反馈延迟的引入显著干扰了被试的伸手行为，尽管被试在实验过程中逐渐适应了视觉反馈延迟。在延迟条件下，即使在正常条件下完成了充分的伸展动作，也有明显的过度伸展的倾向。我们观察到显着的oxyandtotal-Hb的背侧前额叶区的延迟条件下下降。这种减少在任务开始后不久开始，在休息期间减少，表明这种减少是由任务引起的。此外，氧合血红蛋白和总血红蛋白的减少显着相关的任务表现的程度下降较大的主题作出更多的错误。我们认为，在背侧前额叶区的氧合血红蛋白和总血红蛋白的减少与视觉再校准过程。(C)2004 Elsevier B. V.保留所有权利。
Visual feedback of hand movement is crucial to accurate reaching. Although previous studies have extensively examined spatial alteration of visual feedback (e.g., prism adaptation), temporal delay of visual feedback has been less explored. In the present study, we investigated the effect of delayed visual feedback of the moving hand in a reaching task. The prefrontal cortical activity was measured by near-infrared spectroscopy (NIRS). Twelve subjects performed reaching tasks under two conditions where visual feedback of their own hand was delayed by 200 ms (delay condition) or 0 ms (normal condition). Introducing the visual feedback delay significantly disrupted the reaching performance, although the subjects gradually adapted to the delay during the experiment. There was a clear tendency to overreach the target in the delay condition, even after the reaching movement bad been practiced sufficiently in the normal condition. We observed marked oxyand total-Hb decreases in the dorsal prefrontal area in the delay conditions. The decrease began shortly after task onset and diminished during the rest period, indicating that the decrease was task-induced. Furthermore, the oxy- and total-Hb decreases were significantly correlated with task performance-the degree of decrease was larger as the subject made more errors. We suggest that the decreases in oxy- and total-Hb at the dorsal prefrontal area are related with the visuomotor recalibration process. (C) 2004 Elsevier B.V. All rights reserved.