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Heterogeneous Aging Effects on Functional Connectivity in Different Cortical Regions: A Resting-State Functional MRI

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Normal brain aging shows varied changes in functional connectivity across the cerebral cortex. The elderly brain exhibits increased frontal lobe connections but decreased temporal-parietal connections, supporting the frontal aging hypothesis.

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Area of Science:

  • Neuroscience
  • Gerontology
  • Medical Imaging

Background:

  • Brain aging is a complex process with selective functional changes.
  • Previous studies focused on specific brain networks, not whole-brain cortical connectivity.
  • Understanding cortical-cortical connectivity changes is crucial for aging research.

Purpose of the Study:

  • To characterize normal aging effects on cerebral cortex functional connectivity.
  • To introduce a novel Pearson functional product-moment correlation coefficient for connectivity analysis.
  • To compare the proposed method with traditional approaches.

Main Methods:

  • Utilized resting-state functional magnetic resonance imaging (fMRI) data.
  • Applied a novel Pearson functional product-moment correlation coefficient to measure functional connectivity.
  • Analyzed connectivity patterns within and among the four cerebral lobes.

Main Results:

  • Observed heterogeneous changes in functional connectivity during normal aging.
  • Identified enhanced inter-lobe connectivity involving the frontal lobe in the elderly.
  • Found decreased inter-lobe connectivity between the temporal and parietal lobes.

Conclusions:

  • Functional correlation analysis effectively differentiates aging-related connectivity changes.
  • Results support the frontal aging hypothesis.
  • The study highlights regional heterogeneity in brain aging effects on cortical function.