shows the following: 1) Muscle artifacts in the referential iEEG come from the reference signal in this case, and 2) the reference signal was mostly removed using the approach described in [1]. Four bipolar montage iEEGs (LTD3–LTD4, LTD5–LTD6, RTD3–RTD4, and RTD5–RTD6) are also shown in Fig. 3(A) and are all muscle artifact free. This further verifies that, in this example, the artifacts are from the common reference signal and therefore removed in the bipolar montage. Four representative scalp EEG channel recordings (F7, T7, Cz, and Pz) are shown in Fig. 3(B), where electrodes Cz and Pz are close to the scalp reference electrode so that the recordings from Cz (or Pz) reflecting the difference between two electrical potentials measured at the scalp reference electrode and Cz (or Pz) are rather small at most time points. The second four scalp EEG channel recordings (F7, T7, Cz, and Pz) are corrected scalp EEGs of the first four scalp channel recordings (F7, T7, Cz, and Pz). One can see the brain activity in the corrected Cz and Pz. Moreover, muscle artifacts in the referential F7 and T7 were reduced compared with that in the corrected F7 and T7. The reference signal is the
