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Robustifying EEG data analysis by removing outliers

: Krauledat, M.; Dornhege, G.; Blankertz, B.; Müller, K.-R.

Chaos and complexity letters 2 (2007), No.3, pp.259-274
Journal Article
Fraunhofer FIRST ()

Biomedical signals such as EEG are typically contaminated by measurement artifacts, outliers and non-standard noise sources. We propose to use techniques from robust statistics and machine learning to reduce the influence of such distortions. Two showcase application scenarios are studied: (a) Lateralized Readiness Potential (LRP) analysis, where we show that a robust treatment of the EEG allows to reduce the necessary number of trials for averaging and the detrimental influence of e.g. ocular artifacts and (b) single trial classification in the context of Brain Computer Interfacing, where outlier removal procedures can strongly enhance the classification performance.