Residual ocular artefact subsequent to ocular artefact removal from the electroencephalogram

作     者：Jervis, BW Thomlinson, M Mair, C Lopez, JML Garcia, MIB 

作者机构：Sheffield Hallam Univ Sch Engn Sheffield S1 1WB S Yorkshire England Sheffield Hallam Univ Sch Sci & Math Sheffield S1 1WB S Yorkshire England Graz Tech Univ Dept Med Informat A-8010 Graz Austria Escuela Univ Politecn Dept Comp Sci Cordoba Spain 

出 版 物：《IEE PROCEEDINGS-SCIENCE MEASUREMENT AND TECHNOLOGY》 (IEE Proc Sci Meas Technol)

年 卷 期：1999年第146卷第6期

页      面：293-298页

核心收录：

主　　题：Bioelectric signals blinks eye movements scalp potentials out-of-plane model electroencephalogram signals residual ocular artefact in-plane model Electrical activity in neurophysiological processes linear model nerve structure and function Electrodiagnostics and other electrical measurement techniques Physiology of the eye Filtering methods in signal processing signal representation least squares medical signal processing ocular artefact removal eye estimated background EEG power EOG subtraction method vector representation filtering theory least squares approximations electroencephalography radial component 

摘      要：A method based on the vector representation of electro-oculogram (EOG) and electroencephalogram (EEG) signals has been developed for quantifying in simulation the amount of residual ocular artefact (OA) contamination of EECs after the application of an EGG-based OA removal (OAR) algorithm. The residual artefact is measured as R-2, the ratio of residual OA power to the estimated background EEG power. Two types of OA model, the in-plane and the out-of-plane model, were introduced. Values of R-2 were computed using simulated contaminated EEGs, which were constructed using measured EEGs, contaminated by a variety of eye movements and blinks, and measured EOG signals. In most cases the estimate of R-2 was approximately 0.03, corresponding to a 17% modification of the EEG voltage. The radial component contributed up to 30% of the residual artefact power. For practical applications, the use of the vertical and horizontal right and the radial EOG components was found to be preferred.