Key result
A method combining variational mode decomposition (VMD) and second order blind identification (SOBI) showed a better removal effect on EOG and EMG artifacts compared with the EEMD-SOBI method.
Why the study?
Existing methods for single-channel EEG artifact removal using EMD and high-order ICA suffer from modal mixing and suboptimal performance with EMG artifacts.
A novel VMD-SOBI algorithm improves the removal of EOG and EMG artifacts from single-channel EEG signals compared to existing methods.
May enhance single-channel EEG artifact removal; leaves open clinical validation before adoption.
With the development of portable EEG acquisition systems, the collected EEG has gradually changed from being multi-channel to few-channel or single-channel, thus the removal of single-channel EEG signal artifacts is extremely significant. For the artifact removal of single-channel EEG signals, the current mainstream method is generally a combination of the decomposition method and the blind source separation (BSS) method. Between them, a combination of empirical mode decomposition (EMD) and its derivative methods and ICA has been used in single-channel EEG artifact removal. However, EMD is prone to modal mixing and it has no relevant theoretical basis, thus it is not as good as variational modal decomposition (VMD) in terms of the decomposition effect. In the ICA algorithm, the implementation method based on high-order statistics is widely used, but it is not as effective as the implementation method based on second order statistics in processing EMG artifacts. Therefore, aiming at the main artifacts in single-channel EEG signals, including EOG and EMG artifacts, this paper proposed a method of artifact removal combining variational mode decomposition (VMD) and second order blind identification (SOBI). Semi-simulation experiments show that, compared with the existing EEMD-SOBI method, this method has a better removal effect on EOG and EMG artifacts, and can preserve useful information to the greatest extent.
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Liu et al. (2022) studied Single-channel EEG signal artifacts. Variational mode decomposition (VMD) and second order blind identification (SOBI) vs. EEMD-SOBI method was evaluated on Removal effect on EOG and EMG artifacts. A method combining variational mode decomposition (VMD) and second order blind identification (SOBI) showed a better removal effect on EOG and EMG artifacts compared with the EEMD-SOBI method.
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