Using dynamical embedding to isolate seizure components in the ictal EEG
James, C.J. and Lowe, D. (2000) Using dynamical embedding to isolate seizure components in the ictal EEG. IEE Proceedings: Science, Measurement & Technology, 147, (6), 315-320. (doi: 10.1049/ip-smt:20000849).
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A system for isolating seizure components in the epileptic electroencephalogram (EEG) is presented. The method of independent component analysis (ICA) is implemented to decompose multichannel recordings of scalp EEG known to contain epileptic seizures into their underlying independent components (ICs). The ICs are treated as a convenient expansion basis and in order to identify the relevant seizure components amongst the ICs, a series of dynamical embedding matrices are first constructed along each IC. By observing the change in structure of the singular spectra obtained by performing a singular value decomposition on each consecutive dynamical embedding matrix, it is possible to track changes in the underlying complexity of each IC with time. The change in complexity is linked to the change in entropy that can be calculated from each consecutive singular spectrum. The change in complexity, coupled with the topographical distribution of each IC, allows seizure-related components extracted by the ICA process to be subjectively identified. The method has been applied to four seizure EEG segments, and in each case probable seizure components were identified subjectively. As a proof-of-principle study, the method indicates that ICA coupled with dynamical embedding may be useful as a tool in pre-processing seizure EEG segments.
|Keywords:||eeg analysis, consecutive dynamical embedding matrix, dynamical embedding, electrodiagnostics, proof-of-principle study, seizure components isolation, signal pre-processing, singular spectra, topographical distribution|
|Subjects:||R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Q Science > QC Physics
|Divisions:||University Structure - Pre August 2011 > Institute of Sound and Vibration Research > Signal Processing and Control
|Date Deposited:||15 Jun 2005|
|Last Modified:||02 Mar 2012 12:02|
|Contributors:||James, C.J. (Author)
Lowe, D. (Author)
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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