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Illustrative example of EEG data collected during simultaneous EEG–fMRI following the artifacts removal steps. EEG data are displayed: (A) before gradient artifact correction, i.e., raw data, (B) after gradient artifact correction, (C) after BCG artifact correction, and (D) after ICA-based artifacts removal. On the left, EEG signals are reported for five representative channels. On the right, power spectrum density is shown for all EEG recording channels.
