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Employing spatially constrained ICA and wavelet denoising, for automatic removal of artifacts from multichannel EEG data
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Akhtar, Muhammad Tahir, Mitsuhashi, Wataru and James, Christopher J. (2012) Employing spatially constrained ICA and wavelet denoising, for automatic removal of artifacts from multichannel EEG data. Signal Processing: Image Communication, Vol.92 (No.2). pp. 401-416. doi:10.1016/j.sigpro.2011.08.005 ISSN 0923-5965.
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Official URL: http://dx.doi.org/10.1016/j.sigpro.2011.08.005
Abstract
Detecting artifacts produced in electroencephalographic (EEG) data by muscle activity, eye blinks and electrical noise, etc., is an important problem in EEG signal processing research. These artifacts must be corrected before further analysis because it renders subsequent analysis very error-prone. One solution is to reject the data segment if artifact is present during the observation interval, however, the rejected data segment could contain important information masked by the artifact. The independent component analysis (ICA) can be an effective and applicable method for EEG denoising. The goal of this paper is to propose a framework, based on ICA and wavelet denoising (WD), to improve the pre-processing of EEG signals. In particular we employ concept of the spatially constrained ICA (SCICA) to extract artifact-only independent components (ICs) from the given EEG data, use WD to remove any cerebral activity from the extracted-artifacts ICs, and finally project back the artifacts to be subtracted from EEG signals to get clean EEG data. The main advantage of the proposed approach is faster computation, as it is not necessary to identify all ICs. Computer experiments are carried out, which demonstrate effectiveness of the proposed approach in removing focal artifacts that can be well separated by SCICA.
| Item Type: | Journal Article | ||||
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| Subjects: | R Medicine > R Medicine (General) T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||
| Journal or Publication Title: | Signal Processing: Image Communication | ||||
| Publisher: | Elsevier BV | ||||
| ISSN: | 0923-5965 | ||||
| Official Date: | February 2012 | ||||
| Dates: |
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| Volume: | Vol.92 | ||||
| Number: | No.2 | ||||
| Number of Pages: | 16 | ||||
| Page Range: | pp. 401-416 | ||||
| DOI: | 10.1016/j.sigpro.2011.08.005 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Funder: | Center for Frontier Science and Engineering (CFSE), The University of Electro-Communications, Tokyo, Japan |
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