Figure 4.

Details of stimulus timing in the Activity condition. (A) Example EMG recording from the wearable device, and associated stimulus times (arrowheads). Some stimuli were given just after the onset of a contraction (open arrowheads); others occurred in the middle of a tonic contraction (filled arrowheads). (B) Stimulus triggered average of rectified EMG, for the subject shown in (A). A narrow peak in activity is visible just prior to the stimulus (time zero, marked by dotted line and stimulus artifact). N = 11,024 stimuli.