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Mean (SD) probability that TMS evoked a short-latency excitatory response in TA (21 units) and AH (22 units) motor units. There was a significant difference in firing probability for the two muscles (P < 0.004) and a significant effect of stimulus intensity (P < 0.001 by two-way ANOVA). Sum probability indicates the total number of counts within the peak region of the PSTH divided by the total number of stimuli.
