Fig. 2.
A schematic of the construction of connectivity blueprints. Tractography is seeded from the white-grey matter boundary, represented by the purple outline, and then counting the number of visitations to the whole white matter (WM), giving C1 (N~60k by M~58k). Columns of this matrix represent vertex-wise connectivity profiles. Next, the tractography reconstructions produced using XTRACT are vectorised and stacked to give a WM by tracts matrix, C2 (M by T = 41). Multiplying the two matrices gives the connectivity blueprint, CB (N by T). Columns represent maps of tract termination on the white-grey matter boundary surface; rows represent white-grey matter boundary connection profiles and reflect the contribution of each tract to the connection pattern of each white-grey matter boundary vertex.