Synchronization and clustering in electroencephalographic signals

Details Synchronization and clustering in electroencephalographic signals Synchronization and clustering in electroencephalographic signals

2005-06-07

arxiv.org/abs/nlin/0506014v1

Nonlinear Sciences

Chaotic Dynamics

11 pages, 4 figures

Scientific paper

The degree of synchronization and the amount of dynamical cluster formation in electroencephalographic (EEG) signals are characterized by employing two order parameters introduced in the context of coupled chaotic systems subject to external noise. These parameters are calculated in EEG signals from a group of healthy subjects and a group of epileptic patients, including a patient experiencing an epileptic crisis. The evolution of these parameters shows the occurrence of intermittent synchronization and clustering in the brain activity during an epileptic crisis. Significantly, the existence of an instantaneous maximum of synchronization previous to the onset of a crisis is revealed by this procedure. The mean values of the order parameters and their standard deviations are compared between both groups of individuals.

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