Abstract
Electroencephalogram (EEG) signals are often corrupted by undesirable sources like electrooculogram (EOG) artifacts, which have a substantial impact on the performance of EEG-based systems. This study proposes a new singular spectrum analysis (SSA)–non-negative matrix factorization (NMF)-based ocular artifact removal (SNOAR) method to suppress ocular artifacts from multi-channel EEG signals. First, SSA was used to estimate EOG artifacts using a small subset of frontal electrodes. Then, NMF was applied to decompose the estimated EOG artifacts into vertical EOG (VEOG) and horizontal EOG (HEOG) signals. Finally, a simple linear regression with estimated VEOG and HEOG signals was used to remove artifacts from multi-channel EEG signals. EEG recordings from two EEG datasets (Klados dataset and KARA ONE) were used to evaluate the efficiency of the proposed method. From the simulation results, it was observed that the proposed method achieved betters results in terms of low root-mean-square error (RMSE), low delta band energy ratio, and less power spectral density (PSD) difference between the original clean EEG signal and its filtered version of contaminated EEG signal compared to selected EOG artifact removal methods (independent component analysis (ICA), wavelet-enhanced ICA (wICA), improved wICA, and multivariate empirical mode decomposition (MEMD)).
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Acknowledgements
The first author acknowledges the support from the Ministry of Education, Government of India. The second and third authors acknowledge the financial grant received from Core Research Grant of the Science and Engineering Research Board (SERB), Department of Science and Technology (DST), Government of India (CRG/2021/007147).
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Ruchi Juyal, methodology, software, investigation, and writing — original draft. Hariharan Muthusamy, conceptualization, investigation, writing — review and critical revision of the manuscript, validation, and supervision. Niraj Kumar, conceptualization, writing — review and critical revision of the manuscript, and supervision. All authors approved the final version of the manuscript.
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Juyal, R., Muthusamy, H. & Kumar, N. SNOAR: a new regression approach for the removal of ocular artifact from multi-channel electroencephalogram signals. Med Biol Eng Comput 60, 3567–3583 (2022). https://doi.org/10.1007/s11517-022-02692-z
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DOI: https://doi.org/10.1007/s11517-022-02692-z