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Simulating global properties of electroencephalograms with minimal random neural networks

beim Graben, P. and Kurths, J. (2008) Simulating global properties of electroencephalograms with minimal random neural networks. Neurocomputing, 71 (4-6). pp. 999-1007. ISSN 0925-2312

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To link to this article DOI: 10.1016/j.neucom.2007.02.007

Abstract/Summary

The human electroencephalogram (EEG) is globally characterized by a 1/f power spectrum superimposed with certain peaks, whereby the "alpha peak" in a frequency range of 8-14 Hz is the most prominent one for relaxed states of wakefulness. We present simulations of a minimal dynamical network model of leaky integrator neurons attached to the nodes of an evolving directed and weighted random graph (an Erdos-Renyi graph). We derive a model of the dendritic field potential (DFP) for the neurons leading to a simulated EEG that describes the global activity of the network. Depending on the network size, we find an oscillatory transition of the simulated EEG when the network reaches a critical connectivity. This transition, indicated by a suitably defined order parameter, is reflected by a sudden change of the network's topology when super-cycles are formed from merging isolated loops. After the oscillatory transition, the power spectra of simulated EEG time series exhibit a 1/f continuum superimposed with certain peaks. (c) 2007 Elsevier B.V. All rights reserved.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Psychology and Clinical Language Sciences
ID Code:14157
Uncontrolled Keywords:EEG, field potentials, leaky integrator units, random graphs, phase, transitions, order parameter, COMPLEX NETWORKS, ELECTROCORTICAL ACTIVITY, FUNCTIONAL CONNECTIVITY, MATHEMATICAL-MODEL, ALPHA-RHYTHM, MASS MODEL, BRAIN, EEG, POTENTIALS, NEURONS

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