(A) The cortical strength-duration time constant (SDTC), estimated by using 5 pulse widths, was significantly longer when recorded with M-ratio of 0.2 compared to M-ratio 0.025, but not significantly different from that recorded with M-ratio of 0.1. (B) The rheobase (expressed as % of maximum stimulator output, MSO) was significantly smaller with the M-ratio set to 0.2 compared to M-ratio of 0.025, but not significantly different from that recorded with M-ratio of 0.1.