Figure 2:

Matrices used in the simulation study to construct ${\mathcal{A}}^{true}$. Presented are variants for p = 66 (based on the Desikan–Killiany atlas (Desikan et al., 2006)). ${\mathcal{A}}_1$ “homologous regions,” ${\mathcal{A}}_2$ “modularity”, ${\mathcal{A}}_3$ “density of connections, masked” and ${\mathcal{A}}_4$ “neighbouring regions.”