Figure 4. Correlation matrix between FC maps from the nine peak regions observed in Figure 2 (y-axis) and the resting state ICNs taken from Smith et al. (2009). ICN1 to ICN12 are shown on the x-axis. Each hub contained signals from distinct portfolios of the ICNs, suggesting they mediate the cross talk between different combinations of functional networks. The modulation of these multiple subregions during attentional engagement was assessed using a CRT task. Arrows indicate subregions where there was increased or decreased activity during attentive periods of the task compared with rest. Peak regions were (column from top to bottom, ordered by amount of spatial overlap with the default mode network); the right (R) precuneus (Precun), right PCC, right SMG, left (L) inferior TOPJ, left SMG, left superior lateral occipital cortex (Sup LatOcc), right middle temporal gyrus (MTG), right ACC, and left inferior precentral gyrus (Inf PreC). ICN numbers (rows) are: 1, default mode; 2, right frontoparietal; 3, left frontoparietal; 4–6, cognitive control; 7, visual streams; 8, sensorimotor; 9, salience plus auditory; 10, visual-1; 11, visual-2; and 12, visual-3 networks.