MSC is analyzed in Fig. 5(D) for scalp EEG: T7*F7, T7*Cz, T7*Pz, F7*Cz, F7*Pz, and bipolar (F7–T7)*(Cz–Pz). One can see that the MSC values of the referential EEG are smaller (larger) than that of the corrected EEG from 0 to 15 Hz (from 20 to 30 Hz) because of the larger (smaller) power of the corrected EEG compared with that of the reference signal, as seen in Fig. 5(A), where we omit the spectral power of the corrected Cz and Pz which have lower power than the reference signal from 20 to 30 Hz. Hence, the power of the reference signal plays a key role in changing the MSC value of EEG. As such, the higher coherence of the corrected F7*Pz cannot be reflected by the lower coherence of the referential F7*Pz or bipolar (F7–T7)*(Cz–Pz) from 0 to 15 Hz. Similarly, the lower coherence of the corrected T7*Cz cannot be reflected by the higher coherence of the referential F7*Pz from 20 to 30 Hz. Comparing the MSC in Fig. 5(D) and the spectral power in Fig. 5(A), one can see
