Detection and description of non-linear interdependence in normal multichannel human EEG data

Breakspear, M and Terry, JR (2002) Detection and description of non-linear interdependence in normal multichannel human EEG data. Clinical Neurophysiology, 113 5: 735-753. doi:10.1016/S1388-2457(02)00051-2

Author Breakspear, M
Terry, JR
Title Detection and description of non-linear interdependence in normal multichannel human EEG data
Journal name Clinical Neurophysiology   Check publisher's open access policy
ISSN 1388-2467
Publication date 2002
Sub-type Article (original research)
DOI 10.1016/S1388-2457(02)00051-2
Volume 113
Issue 5
Start page 735
End page 753
Total pages 19
Editor P.M. Rossini
F. Pauri
Place of publication Ireland
Publisher Elsevier Science
Collection year 2002
Language eng
Subject C1
230107 Differential, Difference and Integral Equations
780101 Mathematical sciences
Abstract Objectives: This study examines human scalp electroencephalographic (EEG) data for evidence of non-linear interdependence between posterior channels. The spectral and phase properties of those epochs of EEG exhibiting non-linear interdependence are studied. Methods: Scalp EEG data was collected from 40 healthy subjects. A technique for the detection of non-linear interdependence was applied to 2.048 s segments of posterior bipolar electrode data. Amplitude-adjusted phase-randomized surrogate data was used to statistically determine which EEG epochs exhibited non-linear interdependence. Results: Statistically significant evidence of non-linear interactions were evident in 2.9% (eyes open) to 4.8% (eyes closed) of the epochs. In the eyes-open recordings, these epochs exhibited a peak in the spectral and cross-spectral density functions at about 10 Hz. Two types of EEG epochs are evident in the eyes-closed recordings; one type exhibits a peak in the spectral density and cross-spectrum at 8 Hz. The other type has increased spectral and cross-spectral power across faster frequencies. Epochs identified as exhibiting non-linear interdependence display a tendency towards phase interdependencies across and between a broad range of frequencies. Conclusions: Non-linear interdependence is detectable in a small number of multichannel EEG epochs, and makes a contribution to the alpha rhythm. Non-linear interdependence produces spatially distributed activity that exhibits phase synchronization between oscillations present at different frequencies. The possible physiological significance of these findings are discussed with reference to the dynamical properties of neural systems and the role of synchronous activity in the neocortex. (C) 2002 Elsevier Science Ireland Ltd. All rights reserved.
Keyword Clinical Neurology
Chaos Synchronization
Neural Interdependence
Non-linear Forecasting
Synchronous Oscillations
Chaotic Time-series
Generalized Synchronization
Human Electroencephalogram
Dimensional Analysis
Deterministic Chaos
Nonlinear Structure
Filtered Noise
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
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Created: Tue, 14 Aug 2007, 17:02:19 EST