Fig. 1

Spatial and orientation response graphs for both subjects. Normalized MEP amplitudes as a function of 2-dimensional electronic shifting of the stimulation target before (A) and after (B) moving the coil array. The black and white crosses mark the weighted centroid before and after the movement, respectively. The black arrow indicates the zero angle of the peak electric field. The black line forming a right angle serves as an anatomical reference. A Gaussian spatial filter was applied to the data to remove noise and highlight the areas of maximal response. (C) The orientation-dependent MEP response at the centroid (white cross) after moving the coil array in 30-degree increments