Locating spatial patterns of waveforms during sensory perception in scalp EEG

The spatio-temporal oscillations in EEG waves are indicative of sensory and cognitive processing. We propose a method to find the spatial amplitude patterns of a time-limited waveform across multiple EEG channels. It consists of a single iteration of multichannel matching pursuit where the base waveform is obtained via the Hilbert transform of a time-limited tone. The vector of extracted amplitudes across channels is used for classification, and we analyze the effect of deviation in temporal alignment of the waveform on classification performance. Results for a previously published dataset of 6 subjects show comparable results versus a more complicated criteria-based method.

[1]  Walter J. Freeman,et al.  EEG synchrony during a perceptual-cognitive task: Widespread phase synchrony at all frequencies , 2009, Clinical Neurophysiology.

[2]  K. Blinowska,et al.  Multichannel matching pursuit and EEG inverse solutions , 2005, Journal of Neuroscience Methods.

[3]  Walter J. Freeman,et al.  Origin, structure, and role of background EEG activity. Part 1. Analytic amplitude , 2004, Clinical Neurophysiology.

[4]  Walter J. Freeman,et al.  A method to study global spatial patterns related to sensory perception in scalp EEG , 2010, Journal of Neuroscience Methods.

[5]  Jr. S. Marple,et al.  Computing the discrete-time 'analytic' signal via FFT , 1999, Conference Record of the Thirty-First Asilomar Conference on Signals, Systems and Computers (Cat. No.97CB36136).

[6]  Stéphane Mallat,et al.  Matching pursuits with time-frequency dictionaries , 1993, IEEE Trans. Signal Process..

[7]  Donald O. Walter,et al.  Mass action in the nervous system , 1975 .