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Distribution of ipsilateral PStF onset latencies for twin-pulse stimulation at 120 μA. Shown are a proximal muscle group (knee), a distal muscle group (intrinsic foot), and all muscles (hip, knee, ankle, digit, and intrinsic foot) combined for Monkeys L and M. Individual stimuli comprising the twin pulse were separated by 3 ms and repeated at a frequency of 5 Hz. The mean, median, percent of latencies longer than 20 ms, and range for each muscle group are also given.
