phase-synchrony values of the referential or bipolar EEG cannot correctly reflect that of the corrected EEG in some cases and lead to the misinterpretation of EEG. We also note that the correlation and phase-synchrony values for all corrected EEGs decrease heavily from 70 to 80 s. The large decrease is due to multiple artifacts in each channel, such as muscle artifact, eye movement, and eye blink, as seen in Fig. 3(B).
