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A fully automated correction method of EOG artifacts in EEG recordings
A Schlögl1, C Keinrath, D Zimmermann
1Institute of Human-Computer Interfaces, Graz University of Technology, Krenngasse 37/IV, A-8010 Graz, Austria. alois.schloegl@tugraz.at
Objective:
A fully automated method for reducing EOG artifacts is presented and validated.
Methods:
The correction method is based on regression analysis and was applied to 18 recordings with 22 channels and approx. 6 min each. Two independent experts scored the original and corrected EEG in a blinded evaluation.
Results:
The expert scorers identified in 5.9% of the raw data some EOG artifacts; 4.7% were corrected. After applying the EOG correction, the expert scorers identified in another 1.9% of the data some EOG artifacts, which were not recognized in the uncorrected data.
Conclusions:
The advantage of a fully automated reduction of EOG artifacts justifies the small additional effort of the proposed method and is a viable option for reducing EOG artifacts. The method has been implemented for offline and online analysis and is available through BioSig, an open source software library for biomedical signal processing.
Significance:
Visual identification and rejection of EOG-contaminated EEG segments can miss many EOG artifacts, and is therefore not sufficient for removing EOG artifacts. The proposed method was able to reduce EOG artifacts by 80%.
