Independent component analysis separates spikes of different origin in the EEG

Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society
Elena UrrestarazuCésar Viteri

Abstract

Independent component analysis (ICA) is a novel system that finds independent sources in recorded signals. Its usefulness in separating epileptiform activity of different origin has not been determined. The goal of this study was to demonstrate that ICA is useful for separating different spikes using samples of EEG of patients with focal epilepsy. Digital EEG samples from four patients with focal epilepsy were included. The patients had temporal (n = 2), centrotemporal (n = 1) or frontal spikes (n = 1). Twenty-six samples with two (or more) spikes from two different patients were created. The selection of the two spikes for each mixed EEG was performed randomly, trying to have all the different combinations and rejecting the mixture of two spikes from the same patient. Two different examiners studied the EEGs using ICA with JADE paradigm in Matlab platform, trying to separate and to identify the spikes. They agreed in the correct separation of the spikes in 24 of the 26 samples, classifying the spikes as frontal, temporal or centrotemporal, left or right sided. The demonstration of the possibility of detecting different artificially mixed spikes confirms that ICA may be useful in separating spikes or other elements in real EEGs.

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Citations

Mar 13, 2009·Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society·Yaki SternEsther Adi-Japha
Aug 24, 2013·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Pietro AvanziniStefano Meletti
Apr 14, 2009·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Balagopal SantoshkumarSeyed M Mirsattari
Sep 25, 2008·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Anish PatelSeyed M Mirsattari
Jan 28, 2009·Human Brain Mapping·José P MarquesMiguel Castelo-Branco
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Sep 29, 2009·Clinical EEG and Neuroscience·Richard Harner
Dec 5, 2006·Journal of Clinical Neurophysiology : Official Publication of the American Electroencephalographic Society·Jorge IriarteManuel Alegre

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