An iterative subspace denoising algorithm for removing electroencephalogram ocular artifacts
- 1 March 2014
- journal article
- Published by Elsevier BV in Journal of Neuroscience Methods
- Vol. 225, 97-105
- https://doi.org/10.1016/j.jneumeth.2014.01.024
Abstract
Electroencephalogram (EEG) measurements are always contaminated by non-cerebral signals, which disturb EEG interpretability. Among the different artifacts, ocular artifacts are the most disturbing ones. In previous studies, limited improvement has been obtained using frequency-based methods. Spatial decomposition methods have shown to be more effective for removing ocular artifacts from EEG recordings. Nevertheless, these methods are not able to completely separate cerebral and ocular signals and commonly eliminate important features of the EEG. In a previous study we have shown the applicability of a deflation algorithm based on generalized eigenvalue decomposition for separating desired and undesired signal subspaces. In this work, we extend this idea for the automatic detection and removal of electrooculogram (EOG) artifacts from multichannel EEG recordings. The notion of effective number of identifiable dimensions, is also used to estimate the number of dominant dimensions of the ocular subspace, which enables the precise and fast convergence of the algorithm. The method is applied on real and synthetic data. It is shown that the method enables the separation of cerebral and ocular signals with minimal interference with cerebral signals. The proposed approach is compared with two widely used denoising techniques based on independent component analysis (ICA). It is shown that the algorithm outperformed ICA-based approaches. Moreover, the method is computationally efficient and is implemented in real-time. Due to its semi-automatic structure and low computational cost, it has broad applications in real-time EEG monitoring systems and brain-computer interface experiments.Keywords
This publication has 21 references indexed in Scilit:
- The Removal of Ocular Artifacts from EEG Signals Using Adaptive Filters Based on Ocular Source ComponentsAnnals of Biomedical Engineering, 2010
- Enhanced detection of artifacts in EEG data using higher-order statistics and independent component analysisNeuroImage, 2006
- EMG and EOG artifacts in brain computer interface systems: A surveyClinical Neurophysiology, 2006
- Automatic removal of the eye blink artifact from EEG using an ICA-based template matching approachPhysiological Measurement, 2006
- Using ICA for removal of ocular artifacts in EEG recorded from blind subjectsNeural Networks, 2005
- EOG correction: A comparison of four methodsPsychophysiology, 2005
- Optimization of an independent component analysis approach for artifact identification and removal in magnetoencephalographic signalsClinical Neurophysiology, 2004
- Removing electroencephalographic artifacts by blind source separationPsychophysiology, 2000
- Adapting to Unknown Smoothness via Wavelet ShrinkageJournal of the American Statistical Association, 1995
- The quantitative extraction and topographic mapping of the abnormal components in the clinical EEGElectroencephalography and Clinical Neurophysiology, 1991