 Stimulation intensity for theta burst will be set at 60 active motor threshold visit 1, 80 active motor threshold visit 2, and 80 resting motor threshold visit 3. All stimulation is subthreshold, and thus not expected to produce muscle activity. To ensure this is the case, muscle activity will be continuously monitored from the FDI and stimulation will be aborted if any muscle activity during the TBS is detected. 