Phase and amplitude analysis in time-frequency space - application to voluntary finger movement
Phase and amplitude analysis in time-frequency space - application to voluntary finger movement
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DOI：
10.1016/s0165-0270(01)00424-1
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发表时间：
2001-09-30
影响因子：
3
通讯作者：
Durka, PJ
中科院分区：
文献类型：
--
作者：
Ginter, J;Blinowska, KJ;Durka, PJ
采用时频分析方法对手指随意运动时的脑电活动进行了分析。第一种是基于匹配追踪方法的时频域高分辨率功率分布。在不需要带通滤波的情况下，研究了事件相关去同步（ERD）和同步（ERS）现象。详细地观察了μ和β分量的时间演化。第二种方法是基于一个多通道自回归模型（MVAR）适合调查的短期变化的EEG信号。利用短时有向传递函数（SDTF）估计脑电活动传播的方向和频谱内容。发现了运动和感觉皮层不同区域之间的“串扰”证据。证实了与随意运动有关的早期已知现象，并发现了关于局灶性ERD/环绕ERS和运动后同步的β活动的新证据。（C）2001 Elsevier Science B. V.保留所有权利。
Two methods operating in time-frequency space were applied to analysis of EEG activity accompanying voluntary finger movements. The first one, based on matching pursuit approach provided high-resolution distributions of power in time-frequency space. The phenomena of event related desynchronization (ERD) and synchronization (ERS) were investigated without the need of band-pass filtering. Time evolution of mu- and beta -components was observed in a detailed way. The second method was based on a multichannel autoregressive model (MVAR) adapted for investigation of short-time changes in EEG signal. The direction and spectral content of the EEG activity propagation was estimated by means of short-time directed transfer function (SDTF). The evidence of 'cross-talk' between different areas of motor and sensory cortex was found. The earlier known phenomena, connected with voluntary movements, were confirmed and a new evidence concerning focal ERD/surround ERS and beta activity post-movement synchronization was found. (C) 2001 Elsevier Science B.V. All rights reserved.