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Electric field strength (|EF|) heatmaps in F3-F4 and C3-Fp2 montage. Heatmaps of electric field strengths in the brain region (white and gray matter) shown in a typical scale reported in the literature. A decreasing trend in |EF| values, particularly in the brain region underneath the electrodes (the frontal lobe, the precentral and postcentral gyrus), is seen from the youngest (51–55) to oldest (91–95) cohort.
