Figure 1.

(A) Electrode placement on subject's wrist to target median and radial nerves, with counterelectrode positioned on posterior surface of the wrist. (B) Spiral drawing assessments were performed before and after treatment or sham stimulation. Both groups underwent the same frequency calibration and stimulation amplitude setting. Treatment consisted of an average of a 1‐minute ramp‐up of stimulation followed by a 40‐minute stimulation, whereas sham included an average of a 1‐minute ramp‐up followed by a rapid ramp‐down of the stimulation. (C) Representative spirals pre‐ and posttreatment and sham stimulation. (D) Treatment group (n = 10) TETRAS Spiral rating scores with average rating marked with a black line for prestimulation (2.77) and poststimulation (1.77). Two subjects had the same change in rating and had overlapping points. (E) Sham group (n = 13) TETRAS Spiral rating scores with average rating marked with a black line for prestimulation (2.62) and poststimulation (2.37). (F) Tremor amplitude reduction comparison between sham and treatment following stimulation. *P ≤ 0.05; **P ≤ 0.01.