Figure 1.

Primary motor cortex excitability as a function of coil geometry. A) Mean intensity (% of MSO) required to achieve motor threshold with each coil design. B) MEP recruitment curves for each coil, with regression lines fit to the approximately linear part of the curve, i.e. 90%–140% of RMT ([24], [25], [26]). Smaller circles indicate points that were not included in the slope estimation. C) Slope parameters for the recruitment curve fits shown in panel B. F8: Figure-of-eight coil, B: Batwing coil, DC: Double-cone coil. Error bars represent ± 1 standard error of the mean (SEM).