Aging-Related Modular Architectural Reorganization of the Metabolic Brain Network

BACKGROUND Modules in brain network represent groups of brain regions that are collectively involved in one or more cognitive domains. Exploring aging-related reorganization of the brain modular architecture using metabolic brain network could further our understanding about aging-related neuromechanism and neurodegenerations. METHODS In this study, 432 subjects who performed 18F-FDG PET were enrolled and divided into young and old adult groups, as well as female and male groups. The modular architecture was detected, and the connector and hub nodes were identified to explore the topological role of the brain regions based on the metabolic brain network. RESULTS This study revealed that human metabolic brain network was modular and could be clustered into 3 modules. The modular architecture was reorganized from young to old ages with regions related to sensorimotor function clustered into the same module; and the number of connector nodes was reduced and most connector nodes were localized in tempoccipital areas related to visual and auditory functions in old ages. The major gender difference is that the metabolic brain network was delineated into 4 modules in old female group with the nodes related to sensorimotor function split into two modules. DISCUSSION Those findings suggest aging is associated with reorganized brain modular architecture.

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