Change in MT with age (ΔMT) for each region, at each fractional depth through cortex, and then, at five 0.2-mm steps into the white matter underlying cortex. Change is greatest and most widespread at 70% cortical depth. This movie corresponds to Fig. 2D and represents data from the discovery cohort. Movies that correspond to the validation and complete cohorts are available in the VALIDATION.zip and COMPLETE.zip compressed directories in the NSPN Cortical Myelination Figshare Repository within the PYSURFER_IMAGES/COVARS_ones/PNGS/MOVIES subdirectory for each cohort.