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Brain network changes and memory decline in aging.

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Cognitive decline is linked to brain network changes. This study found that altered default mode network (DMN) covariance, not its disengagement, impacts memory performance over time.

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Area of Science:

  • Neuroscience
  • Cognitive Aging Research
  • Brain Network Analysis

Background:

  • Age-related cognitive decline is a growing concern.
  • The default mode network (DMN) is theorized to play a role in cognitive function.
  • Understanding brain network dynamics is crucial for addressing cognitive aging.

Purpose of the Study:

  • To investigate the relationship between default mode network (DMN) functional covariance and age-related cognitive decline.
  • To examine how changes in DMN and verbal memory network (VMN) covariance relate to longitudinal changes in verbal recognition memory.
  • To determine if DMN disengagement is necessary for cognitive performance.

Main Methods:

  • Utilized 15O-water PET scans to measure regional cerebral blood flow in 99 participants from the Baltimore Longitudinal Study of Aging.
  • Analyzed functional covariance within the DMN and VMN during a verbal memory task and resting state.
  • Compared network covariance between participants who improved and those who declined in verbal memory performance over time.

Main Results:

  • Individuals declining in verbal memory showed altered DMN node-to-network coherence and node-to-node covariance compared to improvers.
  • DMN covariance changes were associated with both baseline and longitudinal changes in memory performance.
  • DMN covariance patterns during rest partially mirrored those during task performance, but specific relationships differed.

Conclusions:

  • Disengagement of the DMN during cognitive tasks is not essential for successful performance.
  • Maintaining a balanced covariance within brain networks, particularly the DMN, is crucial for supporting optimal cognitive function during aging.
  • Altered DMN covariance patterns are linked to age-related memory decline.