Fig. 2.

Orientation dependency of the TMS-evoked EEG responses on the left pre-SMA (Subject 1). a Time courses of the TEPs in all channels with selected stimulation orientations (−90°, 0°, 90°). The black cross marks the position of the transducer center relative to the electrode locations (a) and the stimulation site relative to the brain anatomy (b). In b, the left superior frontal gyrus is highlighted in red. c The 36 stimulation orientations. The colours and line styles of the arrows indicate the corresponding stimulation orientations in a and d. d Enlarged TEP time courses of the channel FC1 with all stimulation orientations. e Isocolour plot of the TEP time courses with different stimulus orientations in FC1. f Peak-to-peak amplitudes of the P20−N40 complex in FC1 with different stimulation orientations. The dots depict the single-trial responses, the solid trace is a mean curve, and the shaded area illustrates the standard deviation. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)