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Area of Science:

  • Neuroscience
  • Cognitive Aging Research
  • Brain Network Analysis

Background:

  • Normal aging is linked to reduced whole-brain functional network segregation and cognitive decline.
  • Existing research highlights decreased segregation and increased integration in aging brain connectivity.
  • The impact of aging on large-scale functional network reorganization at the hemispheric level requires further investigation.

Purpose of the Study:

  • To investigate age-related differences in inter-hemispheric interactions.
  • To examine age-related differences in intra-hemispheric integration.
  • To understand hemispheric network reorganization during the adult lifespan.

Main Methods:

  • Utilized resting-state functional MRI (fMRI) data.
  • Analyzed data from a healthy adult lifespan sample.
  • Focused on inter-hemispheric and intra-hemispheric functional connectivity.

Main Results:

  • Observed decreased inter-hemispheric integration across most networks in both hemispheres with aging, excluding the sensorimotor network (SMN) and posterior default mode network (DMN).
  • Identified increased inter-hemispheric segregation in specific networks: left frontoparietal network (FPN), left ventral attention network (VAN), and right auditory (AN), visual (VN), and temporal DMN.
  • Found increased intra-hemispheric integration in bilateral VN and posterior DMN, alongside decreased integration in the right VAN.

Conclusions:

  • Aging significantly reorganizes large-scale functional brain networks at the hemispheric level.
  • Dynamic interactions between functional networks change across the lifespan.
  • These findings offer insights into the mechanisms underlying cognitive aging.