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Electric potential distribution in V over the scalp surface for nearly radial (a) and nearly tangential (b) cortical dipoles (Q = 1.8 nA · m) at the primary motor cortex (coronal plane). c), d) Solutions with all brain compartments included. e), f) Approximate solutions with only three brain compartments (scalp, inner skull, outer skull) included. Note the differences in the maximum amplitudes of the on-skin voltage in every case.
