Functional connectivity within and between brain networks. (A) Functional connectivity strength across defined cortical parcellations (top row) and their network averages (bottom row) is demonstrated in the BCP cohort for unfiltered data. (B) Functional connectivity matrices in the same BCP subjects after application of the notch respiratory filter across identical functional networks. (C) Statistical analysis using a paired t-test comparing the two approaches (unfiltered vs filtered) across functional networks. Here, stronger red indicates higher magnitude fc estimates when filtering data. Networks include: motor, temporal lobe (Temp), posterior frontoparietal (pFPN), posterior cingulate cortex (PCC), lateral visual (lVIS), medial visual (mVIS), dorsal attention (DAN), anterior frontoparietal (aFPN), cingulo-opercular (CO), default mode (DMN), and unassigned (Usp).