Figure 1.

The preprocessing pipeline of the images. (A) First we performed a brain segmentation on the MRI anatomical volumes keeping the gray matter probabilistic map. Subsequently, the gray maps were spatially normalized onto a MNI space of 4 × 4 × 4 mm voxels. (B,B') Resting-state fMRI volumes underwent to several processing phases (alignment and unwarping, coregistration with anatomical volumes, spatial normalization) to extract the Pearson's correlation matrices (D), the counterpart of weighted graphs (E). A similar preprocessing procedure was performed for 18FDG-PET volumes (C,C').