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Empirical data (dots represent average of each subject) and Boltzmann fit (lines) of (A,B) the mean motor-evoked potentials (MEP) stimulus-response curves (SRCs; in μV) and (C,D) the area under the MEP curve (in μV*ms) for pre-intervention (gray) and post-intervention (black) for the subjects with increased cortico-spinal excitability. Each Boltzmann curve is paralleled by thin lines running above/below it that indicate the respective 95% confidence intervals. **p < 0.01.
