Keywords: Aging, Multimodal, tensor-based morphometry (TBM), diffusion-tensor imaging (DTI), cross-sectional, biomarkers
Motivation: Neuroimaging studies, comparing young and old rhesus macaques, have revealed age-related morphological or microstructural brain changes. However, it is unclear at what stage of adult life these changes begin to emerge.
Goal(s): To link morphological and microstructural brain changes within the same animals in a cross-sectional examination across the adult lifespan.
Approach: High-resolution structural and diffusion brain images were collected from adult rhesus macaques across a wide age range. Voxel-wise analyses provided increased sensitivity to partial volume effects.
Results: Age-related brain volumetric atrophy was localized to cortico-striatal regions, while age-associated changes in diffusion metrics were more widespread throughout white matter regions.
Impact: Using a large age-diverse sample, we corroborate and extend previous findings of age-related brain changes in macaques, uncovering additional affected regions undetected with traditional imaging methods. This validates brain biomarkers in a translational animal model of normative human aging.
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