FIGURE 1.

Computer tomography (CT) verification data from one participant and displaying two horizontal CT slices (anterior is uppermost) that show the location of an intramuscular EMG electrode (red circle) within the medial pterygoid muscle (A) and the lateral pterygoid muscle (B). The actual recording region of each electrode is 2–4 mm from the end of the wires illustrated in the centre of each red circle (see Appendix S1).