Phase and amplitude analysis in time-frequency space--application to voluntary finger movement.
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.
Ginter
J
J
Laboratory of Medical Physics, Institute of Experimental Physics, Warsaw University, Hoza 69, 00-681 Warsaw, Poland.
Blinowska
K J
KJ
Kamiński
M
M
Durka
P J
PJ
D000465:Algorithms; D003344:Cortical Synchronization / Q000379:methods*; D004566:Electrodes / Q000592:standards; D019054:Evoked Potentials, Motor / Q000502:physiology*; D005246:Feedback / Q000502:physiology; D005385:Fingers / Q000294:innervation / Q000502:physiology; D005583:Fourier Analysis; D006801:Humans; D007699:Kinesthesis / Q000502:physiology; D008959:Models, Neurological; D009044:Motor Cortex / Q000502:physiology*; D009068:Movement / Q000502:physiology*; D009434:Neural Pathways / Q000502:physiology*; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013003:Somatosensory Cortex / Q000502:physiology*; D013997:Time Factors