Mu and beta rhythm topographies during motor imagery and actual movements

被引:667
作者
McFarland, DJ
Miner, LA
Vaughan, TM
Wolpaw, JR
机构
[1] New York State Dept Hlth, Wadsworth Ctr Labs & Res, Albany, NY 12201 USA
[2] SUNY Albany, Albany, NY 12222 USA
关键词
sensorimotor cortex; mu rhythm; beta rhythm; EEG; imagery;
D O I
10.1023/A:1023437823106
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
People can learn to control the 8-12 Hz mu rhythm and/or the 18-25 Hz beta rhythm in the EEG recorded over sensorimotor cortex and use it to control a cursor on a video screen. Subjects often report using motor imagery to control cursor movement, particularly early in training. We com pared in untrained subjects the EEG topographies associated with actual hand movement to those associated with imagined hand movement. Sixty-four EEG channels were recorded while each of 33 adults moved left- or right-hand or imagined doing so. Frequency-specific differences between movement or imagery and rest, and between right- and left-hand movement or imagery, were evaluated by scalp topographies of voltage and r spectra, and principal component analysis. Both movement and imagery were associated with mu and beta rhythm desynchronization. The mu topographies showed bilateral foci of desynchronization over sensorimotor cortices, while the beta topographies showed peak desynchronization over the vertex. Both mu and beta rhythm left/right differences showed bilateral central foci that were stronger on the right side. The independence of mu and beta rhythms was demonstrated by differences for movement and imagery for the subjects as a group and by principal components analysis. The results indicated that the effects of imagery were not simply an attenuated version of the effects of movement. They supply evidence that motor imagery could play an important role in EEG-based communication, and suggest that mu and beta rhythms might provide independent control signals.
引用
收藏
页码:177 / 186
页数:10
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