Fig. 4.

The effect of TCMS intensity on the amplitude of the D and I waves recorded from an epidural electrode at Th8. The amplitude of each wave was measured from its negative peak to the following positive trough (peak-to-trough). Each bar represents the mean amplitude of each wave, and the error bars represent the SEM. The number above each bar is the number of subjects in the sample. The I₁ wave was recruited at spinal cord-evoked potential T in all 10 subjects, and theD wave was concomitantly recruited withI₁ in 4 of these. At T + 10% the D wave was recruited in 9 of 10 subjects.