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Working Memory Training for Older Participants: A Control Group Training Regimen and Initial Intellectual Functioning Assessment
07:01

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Published on: September 20, 2020

White matter pathways associated with working memory in normal aging.

Rebecca A Charlton1, Thomas R Barrick, I Nigel C Lawes

  • 1Centre for Clinical Neuroscience, Division of Cardiac and Vascular Sciences, St George's University of London, Cranmer Terrace, UK. rcharlton@sgul.ac.uk

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|August 12, 2009
PubMed
Summary
This summary is machine-generated.

White matter integrity, measured by Diffusion Tensor Imaging (DTI), is linked to working memory decline. Specific white matter pathways connect brain regions crucial for working memory function.

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Area of Science:

  • Neuroimaging
  • Cognitive Neuroscience
  • Aging Research

Background:

  • Previous research indicates a correlation between white matter integrity, assessed via Diffusion Tensor Imaging (DTI), and declines in working memory.
  • It is hypothesized that diminished white matter integrity disrupts working memory due to its reliance on dynamic cortico-cortical pathways.

Purpose of the Study:

  • To investigate the association between white matter integrity and working memory performance in healthy middle-aged and elderly adults.
  • To identify specific white matter pathways involved in working memory using advanced neuroimaging techniques.

Main Methods:

  • Diffusion Tensor Imaging (DTI) and working memory assessments were conducted on 99 healthy middle-aged and elderly participants.
  • Voxel-based statistics identified clusters in mean diffusivity images linked to working memory performance variations.
  • Tractography delineated cortico-cortical white matter pathways traversing these clusters, connecting temporal, parietal, and frontal cortices.

Main Results:

  • Significant clusters associated with working memory were found in the white matter of the temporal and frontal lobes, cingulate gyrus, and thalamus.
  • Identified tracts included the superior parietal lobule pathway, medial temporo-frontal pathway, uncinate fasciculus, fronto-parietal fasciculus, and cingulum.
  • These pathways connect grey matter regions activated during working memory tasks.

Conclusions:

  • Specific white matter clusters are significantly associated with working memory performance.
  • Tractography revealed white matter fiber tracts connecting key grey matter regions involved in working memory.
  • Findings support the role of specific white matter pathways in supporting working memory function and align with previous functional connectivity studies.