Figure 7. Patient-specificity was necessary for good model performance.

(A) Linear correlations between the normalized evoked potential (EP) amplitudes and their respective pathway activations aggregated across the entire cohort, where EP₀ (reds) and EP₁ (blues) were normalized by the respective range of amplitudes in each patient (i.e., (value – minimum value) / range of values) and expressed as a percentage. For comparison, the distribution of individual linear regression fits (dashed lines) for all patients are shown. R² = coefficient of determination, CSBT = corticospinal/bulbar tract (n = 8, left), and HDP = hyperdirect pathway (n = 11, right). (B) R² for aggregate fits (open squares) compared to respective patient-specific fits (filled circles). The black arrows point to the respective R² for aggregate fits.