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Related Experiment Video

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A Method for Investigating Age-related Differences in the Functional Connectivity of Cognitive Control Networks Associated with Dimensional Change Card Sort Performance
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Age-dependent changes in task-based modular organization of the human brain.

Kimberly J Schlesinger1, Benjamin O Turner2, Brian A Lopez2

  • 1Department of Physics, University of California, Santa Barbara, CA, USA.

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As people age, brain networks become less coherent and more fragmented. Younger individuals exhibit more stable brain community structures during memory tasks, with specific brain systems showing decreased functional coherence with advancing age.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Network Science

Background:

  • Aging significantly alters human cognition, behavior, and brain function.
  • Brain functional magnetic resonance imaging (fMRI) signals show decreased variability with age.
  • The modular organization of brain function is affected by the aging process.

Purpose of the Study:

  • To investigate the dynamic community structure of large-scale brain function using complex network analysis.
  • To determine how evolving brain communities interact with known brain systems.
  • To examine the impact of aging on the dynamics of brain communities and systems.

Main Methods:

  • Analysis of dynamic networks derived from fMRI scans of 104 human subjects during a word memory task.
  • Determination of time-evolving modular structure by maximizing multislice modularity.
  • Examination of community number and brain region flexibility (community switching).

Main Results:

  • A significant positive correlation was found between age and both community fragmentation and flexibility.
  • Younger subjects displayed more coherent communities and less frequent brain region switching.
  • Specific brain systems (cingulo-opercular, somatosensory, ventral attention, subcortical) showed reduced within-system functional coherence with age.

Conclusions:

  • The dynamics of functional community structure in the brain vary significantly with age.
  • Aging differentially impacts the functional organization of distinct brain systems.
  • Complex network analysis provides methods to investigate age-related changes in brain functional organization.