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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-Related Changes in Inter-Network Connectivity by Component Analysis.

Christian La1, Pouria Mossahebi2, Veena A Nair2

  • 1Neuroscience Training Program, University of Wisconsin-MadisonMadison, WI, USA; Department of Radiology, University of Wisconsin-MadisonMadison, WI, USA.

Frontiers in Aging Neuroscience
|January 7, 2016
PubMed
Summary
This summary is machine-generated.

Healthy aging alters brain connectivity, with older adults showing less segregated networks and reduced anterior-posterior default-mode network (DMN) connectivity. This suggests aging impacts functional brain organization.

Keywords:
ICAagingdedifferentiationdefault-mode networkfMRIfunctional connectivity

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Area of Science:

  • Neuroscience
  • Cognitive Aging
  • Brain Connectivity

Background:

  • Healthy aging involves brain changes impacting cognitive function even before decline is noticeable.
  • Previous research indicates altered connectivity patterns in the default-mode network (DMN), particularly along the anterior-posterior axis.

Purpose of the Study:

  • To investigate the effects of aging on within-network connectivity of three DMN subnetworks (posterior DMN, anterior DMN, ventral DMN).
  • To examine between-network connectivity differences in healthy young and older adults during resting-state.

Main Methods:

  • Utilized group Independent Component Analysis (groupICA) on resting-state fMRI data from 43 young and 43 older healthy adults.
  • Analyzed within-network connectivity of posterior DMN (pDMN), anterior DMN (aDMN), and ventral DMN (vDMN).
  • Assessed between-network connectivity, comparing correlation patterns between components across age groups.

Main Results:

  • A reduction in network co-activation was observed in the pDMN and aDMN subnetworks in older adults.
  • Older adults exhibited a higher number of high-correlation component pairs (46 vs. 34), suggesting reduced functional segregation.
  • Specific differences included increased correlation in visual areas (V2-V1, V2-V4) and decreased correlation between aDMN and pDMN in older adults.

Conclusions:

  • Aging is associated with reduced functional segregation, as evidenced by increased overall connectivity and heightened correlations in visual processing areas.
  • The observed decrease in anterior-posterior DMN connectivity with aging may indicate a breakdown in structural integrity along this axis.
  • These findings provide insights into the neural mechanisms underlying healthy brain aging and cognitive function.