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MEP ratio was expressed as paired-pulse MEP means divided by single-pulse MEP means; thus, lower ratio represents more robust M1 inhibition. Significant preSMA-mediated M1 inhibition occurred in 8-ms inter-stimulus interval trials in controls (p = 0.025; corrected using false discovery rate) but not CTD participants. Error bars represent standard error of mean; individual MEP ratios are also shown.
