Fig. 2.

EDC, but not FDS shows position-dependent changes in excitability. A. In the Non-dominant UE, EDC MEP area (uV.ms) is significantly greater when the shoulder is in abduction (ABD) than in adduction (ADD). FDS shows no significant differences in MEP area whether the UE is in ADD or ABD. B. In the Dominant UE, EDC shows significantly greater MEP area in ADD compared to ABD. C. In the Dominant UE, EDC % Facilitation (change in the mean MEP between onset-offset relative to mean baseline signal 50 ms before the TMS pulse) shows significant interaction between Position x Stimulus intensities. D. Dominant UE, APB shows significantly more % facilitation in ADD compared to ABD. All data points are estimated means and standard errors estimated from mixed models. Thus, for a significant main effect of Position, the model estimated mean reflects the average MEP area across the four stimulation intensities at the given UE position. *shows p < 0.05, ***shows p < 0.001 Rescaled MEP variables shown, see METHODS