Correlations of pathway activation across MT, NMT, SCP, ThF, HDP, and IC, based on biophysical models of a current sweep from 0.5 mA to 4 mA across all electrodes of the directional lead in all subjects. ML pathway not shown due to low occurrence of activation. Each dot is semitransparent, such that sections with overlapping dots appear darker. Plots sorted by descending correlation strength from left to right and top to bottom (non-parametric Spearman correlation coefficients).