I don't think the paper is paywalled: link
MRIs: a lot of different scans including 15 T1 and T2 weighted structural scans; 19 diffusion-weighted scans. fMRI was mostly resting state (100), but also included various tasks such as n-back (15x), motion discrimination/stop signal (8x), object localiser (8x), verbal working memory localiser (5x), spatial WM (4x), breath holding (18x).
Oops! In whatever case I'm back from my situation-with-effectively-only-mobile-internet-access and have the paper now.
The repeated scans were indeed fMRIs measuring correlation of metabolic activity (a good proxy for activity) under various conditions. They made one diffusion tensor map from all their diffusion data (multiple scans). They saw correlations between a fiber-tract map they generated from the diffusion data (you plop down seed points in the cortex and other places and let fibers follow the main directions of diffusion) and their various acti...
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