Pfurtscheller G, Scherer R, Müller-Putz G R, Lopes da Silva F H
Laboratory of Brain-Computer Interfaces, Institute for Knowledge Discovery, Krenngasse 37, A-8010 Graz, Austria.
Eur J Neurosci. 2008 Oct;28(7):1419-26. doi: 10.1111/j.1460-9568.2008.06441.x.
Multi-channel electroencephalography recordings have shown that a visual cue, indicating right hand, left hand or foot motor imagery, can induce a short-lived brain state in the order of about 500 ms. In the present study, 10 able-bodied subjects without any motor imagery experience (naive subjects) were asked to imagine the indicated limb movement for some seconds. Common spatial filtering and linear single-trial classification was applied to discriminate between two conditions (two brain states: right hand vs. left hand, left hand vs. foot and right hand vs. foot). The corresponding classification accuracies (mean +/- SD) were 80.0 +/- 10.6%, 83.3 +/- 10.2% and 83.6 +/- 8.8%, respectively. Inspection of central mu and beta rhythms revealed a short-lasting somatotopically specific event-related desynchronization (ERD) in the upper mu and/or beta bands starting approximately 300 ms after the cue onset and lasting for less than 1 s.
多通道脑电图记录显示，一个指示右手、左手或足部运动想象的视觉提示，能够诱发一种持续时间约为500毫秒的短暂脑状态。在本研究中，10名没有任何运动想象经验的身体健全受试者（新手受试者）被要求想象所指示的肢体运动数秒。应用共同空间滤波和线性单次试验分类来区分两种条件（两种脑状态：右手对左手、左手对足部以及右手对足部）。相应的分类准确率（均值±标准差）分别为80.0±10.6%、83.3±10.2%和83.6±8.8%。对中央μ波和β波节律的检查显示，在提示开始后约300毫秒开始，上μ波和/或β波段出现短暂的躯体感觉定位特异性事件相关去同步化（ERD），持续时间不到1秒。
