Figure 4.

AAL brain regions learned by CNN to be most predictive of the expressive language (top) and receptive language scores (bottom). Each 2D circular connectome presents Circos ideogram available at http://mkweb.bcgsc.ca/tableviewer/. It shows AAL regions and their pair-wise edge strength, ${\overline{S}}_i(m,n)$, quantified by the thickness of individual strips, which are most predictive of the CNN determined score, y_i. Very small magnitudes of positive derivatives (i.e., less than 5 % of maximum value) were omitted for clarity. On the 3D surface images (right panels), the size of each sphere indicates the sum of the positive partial derivative magnitude of edge strength, ${\overline{S}}_i(m,n)$, with respect to the partial derivative of score output, y_i. Here, the greater sphere suggests the region whose edge strengths are more predictive of the score. Note that edge strengths of the right putamen (PUT.R) were found to be the most predictive of expressive language scores, while edge strengths of the left superior parietal gyrus (SPG. L) were the most predictive of receptive language scores. A complete list of region names corresponding to the region labels is available in Table 1.