Modeling the Impact of Lesions in the Human Brain
Figure 2
Structural connectivity, functional connectivity, and measurement of lesion effects.
(A) Top: Intact “unlesioned” structural connectivity (SC). Bottom: lesioned SC. The lesion shown here is L194 and the lesioned portion of the matrix is indicated in light yellow. (B) Top: Unlesioned functional connectivity (FC) matrix, obtained after averaging BOLD cross-correlations from 5 simulation runs. Bottom: lesioned FC matrix (L194), averaged over 5 runs. (C) z-score matrix after subtraction of normalized cross-correlations. (D) Cumulative distribution of z-scores of functional connections after subtraction of lesioned (L194) from unlesioned FC (blue dots) and after subtraction of two sets of 5 unlesioned runs (black dots). The dashed line marks z = 3.3, and the number of functional connections at this threshold was taken as one measure of lesion impact.