Fig. 2.

The relationship between PMA at scan and fibre cross-section (FC). Fixels with a significant positive correlation (corrected p < 0.05) are shown on the top row, and streamlines passing through significant fixels (coloured by direction red: left-right; green: anterior-posterior; blue: inferior-superior) are shown on the bottom row, in the axial plane. The scatter plot shows the correlation between PMA and FC averaged over all significant fixels. The single slice axial plane shows a close up of fixels within a crossing fibre region that are significantly correlated with PMA (red-yellow) overlaid on the fixel template (black), showing that callosal and corticospinal fixels are significantly associated with PMA but not association fibre fixels. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)