Figure 7.

Cartesian maps of motor-evoked potential (MEP) amplitudes as t statistics compared to before transcranial magnetic stimulation (TMS, monophasic; data shown as map color) in experiment 6: bimanual reaction time (RT) task (A) and bimanual dexterity task (B) (27 locations each). The map background colors show the t statistics comparing the mean MEP amplitudes after vs. before TMS, interpolated across all the locations stimulated [scale bar on right; thresholded at t(11) > 2.20, P < 0.05; nonsignificant t statistics are in deep blue]. TMS locations are shown as filled circles. Black symbols: no significant difference between pre- and post-TMS (i.e., no significant MEPs). Red symbols: significant differences (P < 0.05) between pre- and post-TMS. The thick black contour line shows the interpolated threshold level: TMS presented at locations inside the contour induced significant MEPs in the hand muscle. Cz: the white oval shows the mean ± 95% confidence ellipsoid for the origin of the map across participants, at the vertex, Cz[0,0]mm. Data are presented in the same perspective as the participant and brain in Fig. 1.