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The left frontal cortex supports reserve in aging by enhancing functional network efficiency.

Nicolai Franzmeier1, Julia Hartmann1, Alexander N W Taylor2

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Higher left frontal cortex (LFC) connectivity enhances brain network efficiency, supporting memory abilities in aging. This LFC connectivity, influenced by education, is linked to better memory performance.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Brain Imaging

Background:

  • Functional hubs in the brain are crucial for mental health.
  • Left frontal cortex (LFC) connectivity is linked to preserved memory and protective factors.
  • The mechanism by which LFC connectivity supports memory, especially during neurodegeneration, is unclear.

Purpose of the Study:

  • To investigate if LFC connectivity is associated with enhanced efficiency in memory networks.
  • To determine if higher LFC-related network efficiency predicts memory abilities.

Main Methods:

  • fMRI was used to assess LFC connectivity during a memory task in healthy elderly participants.
  • Beta-series correlation analysis measured LFC connectivity to the default mode network (DMN) and dorsal attention network (DAN).
  • Graph theory (small-worldness) estimated network efficiency; regression and mediation analyses tested associations.

Main Results:

  • Higher LFC connectivity to DMN and DAN correlated with increased network small-worldness during memory tasks.
  • LFC connectivity mediated the relationship between education and DMN/DAN small-worldness.
  • Increased network small-worldness predicted better memory performance.

Conclusions:

  • Higher education-associated LFC connectivity enhances memory network efficiency.
  • This improved efficiency contributes to a greater reserve of memory abilities during aging.
  • Findings highlight the role of LFC connectivity and network efficiency in cognitive reserve.