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Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging
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General cognitive function and the brain's structural connectome.

Colin R Buchanan1,2,3, Joanna E Moodie1,2, Venia Batziou4

  • 1Lothian Birth Cohorts, Department of Psychology, The University of Edinburgh, Edinburgh, UK.

Biorxiv : the Preprint Server for Biology
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PubMed
Summary
This summary is machine-generated.

General cognitive function (g) relies on a widespread white matter network. This brain connectivity

Keywords:
brain networkscognitive functionconnectomediffusion MRI

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • General cognitive function (g) involves flexible information processing.
  • The brain's structural connectivity supporting 'g' is not fully understood.
  • White matter integrity is crucial for cognitive abilities.

Purpose of the Study:

  • To map the relationship between brain-wide structural connectivity and general cognitive function (g).
  • To investigate how white matter network properties contribute to 'g' across the adult lifespan.
  • To explore the convergence of grey and white matter contributions to cognition.

Main Methods:

  • Utilized diffusion MRI data from 38,824 individuals across three cohorts.
  • Employed meta-analytic associations using streamline count (SC), fractional anisotropy (FA), and mean diffusivity (MD) weightings.
  • Examined global, nodal, and edge-level white matter associations with 'g', considering inter- and intra-hemispheric connectivity.

Main Results:

  • 'g' is supported by a widely distributed white matter network spanning all cerebral lobes and subcortical structures.
  • Associations between white matter properties and 'g' were observed at global, nodal, and edge levels.
  • White matter findings mirrored cortical morphometry associations, indicating convergent grey and white matter influences.
  • Age modulated these associations, with increased relevance of white matter integrity in older adults, particularly in frontal regions.

Conclusions:

  • General cognitive function (g) is underpinned by a distributed structural communication backbone.
  • The integrity of this white matter network is essential for cognitive performance and becomes increasingly important with age.
  • Findings highlight the complex interplay between brain structure, connectivity, and cognitive abilities across adulthood.