Changes in myelination are prominent throughout brain development. Here, we assess MTsat as a measure of intracortical myelination in the developing marmoset brain with 38 subjects from infancy to adulthood. We find that the measure is consistent between brains and that across the cortex as a whole, adults differ in apparent myelination compared with infants and early adolescents particularly within central and deeper cortical layers. Regional analysis with this metric will facilitate differentiation between morphological and microstructural developmental changes that cannot be elucidated with conventional structural imaging.
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