DocumentCode :
1287793
Title :
Residual ocular artefact subsequent to ocular artefact removal from the electroencephalogram
Author :
Jervis, B.W. ; Thomlinson, M. ; Mair, C. ; Lopez, J.M.L. ; Garcia, M.I.B.
Author_Institution :
Sch. of Eng., Sheffield Hallam Univ., UK
Volume :
146
Issue :
6
fYear :
1999
fDate :
11/1/1999 12:00:00 AM
Firstpage :
293
Lastpage :
298
Abstract :
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 EEGs after the application of an EOG-based OA removal (OAR) algorithm. The residual artefact is measured as R2, 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 R2 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 R2 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
Keywords :
electroencephalography; eye; filtering theory; least squares approximations; medical signal processing; signal representation; EOG subtraction method; blinks; electroencephalogram signals; estimated background EEG power; eye movements; in-plane model; least squares; linear model; ocular artefact removal; out-of-plane model; radial component; residual ocular artefact; scalp potentials; vector representation;
fLanguage :
English
Journal_Title :
Science, Measurement and Technology, IEE Proceedings -
Publisher :
iet
ISSN :
1350-2344
Type :
jour
DOI :
10.1049/ip-smt:19990703
Filename :
815887
Link To Document :
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