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Cognitive intraindividual variability and white matter integrity in aging.

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Cognitive variability increases with age. White matter integrity, measured by diffusion tensor imaging (DTI), is more closely linked to this variability than to average cognitive performance.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Medical Imaging

Background:

  • Cognitive performance variability increases with age, yet its neural underpinnings are poorly understood.
  • Research has primarily focused on average cognitive function, neglecting intraindividual variability (IIV).
  • Emerging evidence suggests white matter (WM) integrity may be more strongly associated with IIV than with mean performance.

Purpose of the Study:

  • To investigate the relationship between white matter (WM) integrity and cognitive intraindividual variability (IIV) across the adult lifespan.
  • To combine functional magnetic resonance imaging (fMRI) and diffusion tensor imaging (DTI) to explore neural correlates of cognitive IIV.
  • To compare age-related differences in WM integrity associated with cognitive performance.

Main Methods:

  • Participants: 12 young adults (18-30 years) and 13 older adults (61-82 years).
  • Neuroimaging: fMRI and DTI were used to assess brain activity and white matter structure.
  • Data Analysis: Neuropsychological task data were correlated with DTI parameters (fractional anisotropy, mean, radial, and axial diffusivity) in WM regions of interest defined by fMRI activation and an atlas.

Main Results:

  • Diffusion tensor imaging (DTI) parameters, reflecting white matter (WM) integrity, were significantly more related to intraindividual variability (IIV) in cognitive performance than to mean performance levels.
  • Age-related differences in DTI parameters were more pronounced in brain regions primarily activated by young adults during a choice reaction-time task.
  • These findings suggest that age-related decline in WM integrity disproportionately affects cognitive processes more engaged by younger individuals.

Conclusions:

  • White matter (WM) integrity is a crucial factor associated with intraindividual variability (IIV) in cognitive function, particularly in aging.
  • Diffusion tensor imaging (DTI) provides valuable insights into the neural basis of cognitive variability, complementing studies on mean performance.
  • Age-related changes in WM integrity may underlie differential impacts on cognitive tasks, highlighting the importance of considering task-specific neural engagement.