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The difference between the poststimulus interspike interval (ISI-0) and the 3 ISIs preceding the stimulation (ISI-pre) for stimulus and control conditions in each of the 56 motor units before practice (A) and the 62 motor units after practice (B). The difference between the ISI-0 and ISI-pre averaged for all motor units within a subject (n = 15) before and after practice (C).
