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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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Published on: May 7, 2014

Aging and functional brain networks.

D Tomasi¹, N D Volkow

¹National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD, USA. tomasi@bnl.gov

Molecular Psychiatry

|July 6, 2011

Summary

This summary is machine-generated.

Aging impacts brain connectivity, particularly long-range connections in the default-mode network (DMN) and dorsal attention network (DAN). These changes may explain age-related declines in attention and cognitive function.

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Area of Science:

Neuroscience
Cognitive Aging
Brain Imaging

Background:

Aging is linked to brain structural and functional changes, often leading to cognitive decline.
Previous research highlighted aging's effect on the default-mode network (DMN), but effects on other networks remain less understood.
Functional connectivity density (FCD) is a key metric for understanding brain network organization.

Purpose of the Study:

To investigate how aging affects short- and long-range functional connectivity density (FCD) hubs in the default-mode network (DMN) and other brain networks.
To determine if aging-related changes in FCD differ between short-range and long-range connections.
To explore potential sex differences in aging-related FCD changes.

Main Methods:

Utilized resting-state functional magnetic resonance imaging (fMRI) data from 913 healthy individuals.
Applied functional connectivity density mapping (FCDM), a voxelwise, data-driven approach, to analyze FCD.
Employed parallel computing for efficient analysis of large datasets.

Main Results:

Aging was associated with decreased long-range FCD in the DMN and dorsal attention network (DAN).
Increased FCD was observed in somatosensory and subcortical networks with aging.
Long-range connections showed greater vulnerability to aging effects than short-range connections across networks.
Aging effects were significant in major functional hubs, particularly for long-range FCD.

Conclusions:

Long-range brain connections are more susceptible to aging than short-range connections.
The DMN and DAN are significantly affected by aging, potentially contributing to age-related attention deficits.
Understanding these network changes is crucial for addressing cognitive decline in aging populations.