Fig. 4.

Effectiveness of stimulation at producing poststimulus EMG effects, determined for each muscle by calculating the percentage of sites from which a poststimulus EMG effect (PStE) was observed for each muscle. Percentages are subdivided based on the laterality of the responses evoked from each muscle. The height of the black bar represents the proportion of PStEs that produced a bilateral response, the gray bar represents ipsilateral responses, and the white bar represents contralateral responses. UTR, upper trapezius.