Fig. 4
(A) original unprocessed EEG epoch, (B) EEG epoch after power line interference removal using a 3rd-order notch Butterworth filter, (C) time–frequency domain representation of the EEG epoch following level 4 DWT.
Fig. 4 | Scientific Reports
(A) original unprocessed EEG epoch, (B) EEG epoch after power line interference removal using a 3rd-order notch Butterworth filter, (C) time–frequency domain representation of the EEG epoch following level 4 DWT.
