Time-varying bispectral analysis of auditory evoked multi-channel scalp EEG

Chandran, Vinod (2012) Time-varying bispectral analysis of auditory evoked multi-channel scalp EEG. In 11th International Conference on Information Science, Signal Processing and their Applications (ISSPA '12), 3-5 July 2012, Montreal, Canada.

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Abstract

Time-varying bispectra, computed using a classical sliding window short-time Fourier approach, are analyzed for scalp EEG potentials evoked by an auditory stimulus and new observations are presented. A single, short duration tone is presented from the left or the right, direction unknown to the test subject. The subject responds by moving the eyes to the direction of the sound. EEG epochs sampled at 200 Hz for repeated trials are processed between -70 ms and +1200 ms with reference to the stimulus. It is observed that for an ensemble of correctly recognized cases, the best matching timevarying bispectra at (8 Hz, 8Hz) are for PZ-FZ channels and this is also largely the case for grand averages but not for power spectra at 8 Hz. Out of 11 subjects, the only exception for time-varying bispectral match was a subject with family history of Alzheimer’s disease and the difference was in bicoherence, not biphase.

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ID Code: 50757
Item Type: Conference Paper
Refereed: Yes
Keywords: EEG, HOS, human vision, bicoherence, time-varying
DOI: 10.1109/ISSPA.2012.6310547
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 Please consult the author
Deposited On: 10 Jul 2012 02:47
Last Modified: 18 Feb 2013 02:28

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