标题: 视觉动作追踪任务中触觉回馈辅助之生理变化
Physiological Correlates of Haptic Feedback in a Visuomotor Tracking Task
作者: 林君玲
Lin, Chun-Ling
林进灯
Lin, Chin-Teng
电控工程研究所
关键字: 触觉回馈辅助;脑电波;事件相关频谱扰动;事件相关电聚合现象;因果关系;haptic feedback;electroencephalograph (EEG);electroencephalograph (EEG), event-related spectral perturbation (ERSP);event-related coherence (ERCOH);granger causality (GC)
公开日期: 2011
摘要: 本研究主要探讨在视觉动作追踪的任务中,触觉回馈辅助如何影响运动过程的效能表现以及大脑的动态变化。为了避免生理现象的个体差异,本研究分别设计了两个实验来分别探讨触觉回馈辅助对于运动过程的效能表现以及大脑的动态变化的影响。在两个实验的过程中,触觉回馈辅助会以轨迹偏差的状况给于相对的回馈辅助。而在实验二中,在给于触觉回馈辅助的同时,也会量测脑波讯号electroencephalogram (EEG)。并运用独立成分分析 (Independent component analysis)将所收录的脑波讯号分离并得到不同的脑区来源。再利用聚集分析(Clustering analysis)比较分析受测者之间的脑区来源。 再者,各脑区来源采取事件相关频谱扰动(event related spectral perturbation, ERSP)、事件相关电聚合现象 (event-related coherence, ERCOH) 和因果关系 (granger causality, GC) 的分析方法来比较当实验具有触觉回馈辅助和没有触觉回馈辅助情况下的大脑的动态变化。实验一结果证实触觉回馈辅助的确可以有效改善视觉动作追踪的效能。实验二结果显示在有触觉回馈辅助的情况下,脑区位于右运动区脑波均会呈现较大的Alpha波的抑制。脑区位于左前额骨中间区、左运动区、右运动区和顶叶区的脑波均呈现较大的Beta波的抑制。脑区位于左前额骨、左运动区和右运动区的脑波均呈现gamma波的抑制。相反的,脑区位于右枕骨则呈现了较少的Beta波的抑制。事件相关电聚合现象和因果关系的结果显示在具有触觉回馈辅助下,其脑波的聚合结果和因果关系都会呈现将高的相关性。本研究提供了一个新的观点来观察触觉回馈辅对于脑的动态变化的影响,并提出触觉回馈辅可能是一个工具可用来改善人们在运动学习过程中的效能表现。
This study investigates the temporal behavioral performance and brain dynamics associated with haptic feedback in a visuomotor tracking task. In order to avoid the individual differences in physiological activity, the present study designs two experiments to investigate the differences in motor performance and brain activities between visuomotor tracking in both the presence and absence of haptic guidance, separately. In two experiments, haptic feedback with deviation-related forces was used throughout tracking experiments. In second experiment, subjects' behavioral responses and electroencephalogram (EEG) data were simultaneously measured. Independent component analysis was employed to decompose the acquired EEG signals into temporally independent time courses arising from distinct brain sources. Clustering analysis was used to extract independent components that were comparable across participants. The resultant independent brain processes were further analyzed via time-frequency analysis (event-related spectral perturbation, ERSP), event-related coherence (ERCOH) and granger causality (GC) to contrast brain activity during tracking experiments with or without haptic feedback. The results of behavioral experiment demonstrated that the tracking performance in epochs with haptic feedback were significantly smaller than in those without feedback. In the second experiment, across subjects, in epochs with haptic feedback, components with equivalent dipoles in or near the right motor region exhibited greater alpha band power suppression. Components with equivalent dipoles in or near the left frontal, central, left motor, right motor, and parietal regions exhibited greater beta-band power suppression, while components with equivalent dipoles in or near the left frontal, left motor, and right motor regions showed greater gamma-band power suppression relative to non-haptic conditions. In contrast, the right occipital component cluster exhibited less beta-band power suppression in epochs with haptic feedback compared to non-haptic conditions. The results of ERCOH and GC analysis of the six component clusters showed that there were significant increases in coherence and directed transfer function (dDTF) values between different brain networks in response to haptic feedback relative to the coherence and dDTF values observed when haptic feedback was not present. The results of this study provide novel insight into the effects of haptic feedback on the brain and may aid the development of new tools to improve the performance of visuomotor task.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT079512821
http://hdl.handle.net/11536/41097
显示于类别:Thesis