Recently, the difficulties associated with using common referential EEG recordings for correlation analysis [32], coherence analysis [29], [33], [34], and phase-synchrony analysis [22], [32], [35] have been raised and are now well established. Unfortunately, all the aforementioned references investigating neuronal synchronization have used either common referential EEG recordings or common reference-free EEG recordings, such as bipolar EEG, average common reference EEG, and Laplacian EEG.
