1. Determination of the motor threshold by (1) finding the most excitable region in the hand knob which elicits the strongest compound muscle action potential (CMAP) in the APB muscle; (2) finding the motor threshold by determining output stimulation intensity which generates peak to peak CMAP response above 50 mV (Millivolts) in 5/10 stimulation cycles (Rossini et al., 1994).