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IEEE Trans Neural Syst Rehabil Eng. 2016 Mar;24(3):309-19. doi: 10.1109/TNSRE.2015.2508759. Epub 2015 Dec 17.

Real-Time Adaptive EEG Source Separation Using Online Recursive Independent Component Analysis.

Abstract

Independent component analysis (ICA) has been widely applied to electroencephalographic (EEG) biosignal processing and brain-computer interfaces. The practical use of ICA, however, is limited by its computational complexity, data requirements for convergence, and assumption of data stationarity, especially for high-density data. Here we study and validate an optimized online recursive ICA algorithm (ORICA) with online recursive least squares (RLS) whitening for blind source separation of high-density EEG data, which offers instantaneous incremental convergence upon presentation of new data. Empirical results of this study demonstrate the algorithm's: 1) suitability for accurate and efficient source identification in high-density (64-channel) realistically-simulated EEG data; 2) capability to detect and adapt to nonstationarity in 64-ch simulated EEG data; and 3) utility for rapidly extracting principal brain and artifact sources in real 61-channel EEG data recorded by a dry and wearable EEG system in a cognitive experiment. ORICA was implemented as functions in BCILAB and EEGLAB and was integrated in an open-source Real-time EEG Source-mapping Toolbox (REST), supporting applications in ICA-based online artifact rejection, feature extraction for real-time biosignal monitoring in clinical environments, and adaptable classifications in brain-computer interfaces.

PMID:
26685257
PMCID:
PMC4824543
[Available on 2017-03-01]
DOI:
10.1109/TNSRE.2015.2508759
[PubMed - indexed for MEDLINE]
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