Phase and amplitude analysis in time-frequency space--application to voluntary finger movement.

Full Abstract

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.

Author information

Author/s: Ginter, J (J); Blinowska, K J (KJ); Kaminski, M (M); Durka, P J (PJ);

Affiliation: Laboratory of Medical Physics, Institute of Experimental Physics, Warsaw University, Hoza 69, 00-681 Warsaw, Poland.

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't

Journal: Journal of neuroscience methods (J Neurosci Methods), published in Netherlands. (Language: eng)

Reference: 2001-Sep; vol 110 (issue 1-2) : pp 113-24

Dates: Created 2001/09/20; Completed 2001/12/07; Revised 2006/11/15;

PMID: 11564531, status: MEDLINE (last retrieval date: 2/18/2009, IMS Date: )

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