White matter connectivity of DMN. (A) A probability map (red-yellow) of white matter tracts from the posterior DMN seed (the precuneus; shown in light blue; see Materials and Methods section for details) is shown based on probabilistic tractography averaged across subjects. Overlaid are masks to estimate structural connection strengths: the SFG (shown in jade) and rMFG (shown in purple) for the anterior DMN (shown in green); and the mOFG (shown in red) for the executive control network network (ECN; shown in blue). The functional network masks were derived from an atlas (http://findlab.stanford.edu/functional_ROIs.html). Based on calculations of the overlap between each functional atlas and each anatomical mask, these masks were the most representative of each functional network (see Materials and Methods section for details). Masks were registered to and overlaid with a Montreal Neurological Institute 152 T1 structural image. (B) Mean connection strengths of posterior DMN across the frontal masks. Hippo, hippocampus. Error bars indicate 95% confidence interval.