Volume conduction

Volume conduction (the passive flow of current across the scalp, skull, and cerebrospinal fluid) strongly influences scalp potential EEG coherence (Srinivasan et al. 1998; Nunez and Srinivasan 2006). Volume conduction has been shown in electrical models of the head to introduce artificial coherence between electrodes separated by less than 10--12 cm (Srinivasan et al. 1998). Thus, EEG potential coherence measurements are only meaningful for widely spaced electrode pairs.

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