Fig. 3.

High-level bilateral FB subsystem interactions. (A) The two top-level subsystems (SS1 and SS2) are mirror images, each having all but 1 (retina [R]) of its 233 regions on one side of the brain (Fig. 2, third column). As measured by WCD (aggregate connection strength/total number of regions, ×100), their intrinsic connections are 12.7× stronger than connections between them (4.82 vs. 0.38). (B) Schematic diagram of second-level interaction strengths (line thickness approximately proportional to WCD value). (C) Spatial distribution of the first (blue; SS1.1 and SS2.1) and second (red; SS1.2 and SS2.2) second-level subsystems displayed on an expanded flat map (Fig. 1A), color-coded with B. (D) Matrix of all subsystem interconnections for the FB2f network, with matrix entries recording each subsystem pair’s WCD computed (as a mean across all its constituent region pairs) from data in Fig. 2, Top of third column. Subsystem pairs with regions in common are marked with a white circle. See A Network of Subsystems for details. For flat map details, see Fig. 4. Adapted from ref. 28. For ordered list of subsystems in D, see Figs. 5 and 6 and Dataset S4S. Abbreviations are in Fig. 1.