Fig 2. Ratio data of all twelve measures of RMS during the stimulus period to the RMS during the baseline period at different stimulus level ranges, for the same subject as in Fig 1.

Note that for this subject, performance improved in all directions (ML, AP, and APML) at the same stimulus amplitude range of ±350 μA. Further, this subject had to be assisted to prevent falling and did not complete trials at the two highest nominal stimulation levels tested (±2800 μA, ±3300 μA).