Functional connections used in the classification of the OCD and HC populations. (a) The 200 most contributing FCs from the left (left top), posterior (left bottom), and top (right) to the WLSs are visualized. (b) Matrices for the most contributing 200 FCs in 18 macroscale regions that were functionally defined in a previous study35. Diagonal and non-diagonal elements show within- and between-network FCs, respectively. The blue box highlights the corresponding area in the matrix discussed in the main text, i.e., FC between the orbitofrontal and basal ganglia-thalamus networks. The color bar indicates the number of FCs included between two networks. (c) Circle plot of the 200 most contributing 200 FCs in 18 macroscale regions. The number of FCs in each of the 2 macroscale regions is presented as the thickness of the connection lines (edges). The connections within the same network are colored blue, and connections between two different networks are colored red.