Online removal of ocular artefacts from the electroencephalogram

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Author
Thomlinson, M.
López, J.M.L.
García, M.I.B.
Jervis, B.W.
Publisher
Institution of Engineering and TechnologyDate
2004Subject
EEG SignalsEOG
Electroencefalografía
Electrodiagnóstico
Biomicroscopía ocular
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A method by which ocular artefacts (OAs) in the electroencephalogram (EEG) may be removed automatically online by electro-oculogram (EOG) subtraction is demonstrated. This is achieved by a combination of recursively calculating the required cross-correlations, a fast matrix inversion method, and the use of a modem microprocessor with a high clock rate. Although recursive calculations are involved, the method itself is essentially non-recursive, which means that distortion of any evoked potentials is minimised. The method may be applied simultaneously to any number of EEG channels.