Figure 3
From: The coil orientation dependency of the electric field induced by TMS for M1 and other brain areas
Electric field for five coil orientations over M1: The electric field distribution (V m−1), just within the cortex, for M1 stimulation with the standard coil orientation (1st column) and 4 other orientations (+40 (2nd column), +90 (3rd column), +150 (4th column) and +180 (5th column) degrees of clockwise rotation). The field strength \( \left|\overrightarrow{\mathrm{E}}\right| \) (top row) and the field strength perpendicular to the CSF-GM boundary E⊥ (bottom row) are shown. For the later scale, a positive value means directed inward and a negative means directed outward. The black dot indicates the location of the center of the TMS coil. The direction of the primary electric field directly under the coil center is indicated with the black arrow.