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Space-time ICA versus Ensemble ICA for ictal EEG analysis with component differentiation via Lempel-Ziv complexity
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James, C. J., Abasolo, Daniel and Gupta, Disha (2007) Space-time ICA versus Ensemble ICA for ictal EEG analysis with component differentiation via Lempel-Ziv complexity. In: EMBS 2007. 29th Annual International Conference of the IEEE , Lyon, France, August 23rd-26th. Published in: IEEE Engineering in Medicine and Biology Society. Conference Proceedings, Vol. 2007 pp. 5473-5476. doi:10.1109/IEMBS.2007.4353584 ISSN 1557-170X.
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Official URL: http://dx.doi.org/10.1109/IEMBS.2007.4353584
Abstract
In this proof-of-principle study we analyzed intracranial electroencephalogram recordings in patients with intractable focal epilepsy. We contrast two implementations of independent component analysis (ICA) - ensemble (or spatial) ICA (E-ICA) and space-time ICA (ST-ICA) in separating out the ictal components underlying the measurements. In each case we assess the outputs of the ICA algorithms by means of a non-linear method known as the Lempel-Ziv (LZ) complexity. LZ complexity quantifies the complexity of a time series and is well suited to the analysis of non-stationarity biomedical signals of short length. Our results show that for small numbers of intracranial recordings, standard E-ICA results in marginal improvements in the separation as measured by the LZ complexity changes. ST-ICA using just 2 recording channels both near and far from the epileptic focus result in more distinct ictal components - although at this stage there is a subjective element to the separation process for ST-ICA. Our results are promising showing that it is possible to extract meaningful information from just 2 recording electrodes through ST-ICA, even if they are not directly over the seizure focus. This work is being further expanded for seizure onset analysis.
Item Type: | Conference Item (Paper) | ||||
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Divisions: | Faculty of Social Sciences > School of Health and Social Studies | ||||
Journal or Publication Title: | IEEE Engineering in Medicine and Biology Society. Conference Proceedings | ||||
Publisher: | IEEE | ||||
ISSN: | 1557-170X | ||||
Book Title: | 2007 29th Annual International Conference of the IEEE Engineering in Medicine and Biology Society | ||||
Official Date: | 2007 | ||||
Dates: |
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Volume: | Vol. 2007 | ||||
Page Range: | pp. 5473-5476 | ||||
DOI: | 10.1109/IEMBS.2007.4353584 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Conference Paper Type: | Paper | ||||
Title of Event: | EMBS 2007. 29th Annual International Conference of the IEEE | ||||
Type of Event: | Conference | ||||
Location of Event: | Lyon, France | ||||
Date(s) of Event: | August 23rd-26th |
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