Pfurtscheller G, Brunner C, Schlögl A, Lopes da Silva F H
Laboratory of Brain-Computer Interfaces, Institute for Computer Graphics and Vision, Graz University of Technology, Inffeldgasse 16a, A-8010 Graz, Austria.
Neuroimage. 2006 May 15;31(1):153-9. doi: 10.1016/j.neuroimage.2005.12.003. Epub 2006 Jan 27.
We studied the reactivity of EEG rhythms (mu rhythms) in association with the imagination of right hand, left hand, foot, and tongue movement with 60 EEG electrodes in nine able-bodied subjects. During hand motor imagery, the hand mu rhythm blocked or desynchronized in all subjects, whereas an enhancement of the hand area mu rhythm was observed during foot or tongue motor imagery in the majority of the subjects. The frequency of the most reactive components was 11.7 Hz +/- 0.4 (mean +/- SD). While the desynchronized components were broad banded and centered at 10.9 Hz +/- 0.9, the synchronized components were narrow banded and displayed higher frequencies at 12.0 Hz +/- 1.0. The discrimination between the four motor imagery tasks based on classification of single EEG trials improved when, in addition to event-related desynchronization (ERD), event-related synchronization (ERS) patterns were induced in at least one or two tasks. This implies that such EEG phenomena may be utilized in a multi-class brain-computer interface (BCI) operated simply by motor imagery.
我们使用60个脑电图电极，对9名身体健全的受试者进行研究，观察与右手、左手、足部和舌头运动想象相关的脑电图节律（μ节律）反应性。在手部运动想象期间，所有受试者的手部μ节律均出现阻断或去同步化，而在大多数受试者的足部或舌头运动想象期间，观察到手部区域μ节律增强。最具反应性成分的频率为11.7 Hz±0.4（平均值±标准差）。去同步化成分呈宽带状，中心频率为10.9 Hz±0.9，而同步化成分呈窄带状，在12.0 Hz±1.0处显示出更高的频率。当除了事件相关去同步化（ERD）之外，至少在一两个任务中诱导出事件相关同步化（ERS）模式时，基于单个脑电图试验分类对四种运动想象任务的辨别能力得到提高。这意味着这种脑电图现象可用于仅通过运动想象操作的多类别脑机接口（BCI）。
