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Related Experiment Video

Updated: Jan 22, 2026

A Versatile Murine Model of Subcortical White Matter Stroke for the Study of Axonal Degeneration and White Matter Neurobiology
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Reaction time variability and brain white matter integrity.

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Intraindividual variability (IIV) in choice reaction time (CRT) was not incrementally predictive of white matter integrity. Findings suggest mean speed of responding is a more robust indicator than IIV in this context.

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Area of Science:

  • Neuroimaging
  • Cognitive Neuroscience
  • Aging Research

Background:

  • Reaction time (RT) is crucial for assessing cognitive function.
  • Intraindividual variability (IIV) in RT, reflecting response inconsistency, is increasingly studied for its link to central nervous system integrity.
  • Previous research on IIV and brain imaging metrics yielded inconsistent results.

Purpose of the Study:

  • To comprehensively evaluate associations between brain white matter integrity and individual differences in choice RT (CRT) IIV.
  • To investigate if IIV offers unique insights into white matter health beyond mean response speed.

Main Methods:

  • Utilized MRI scans from the Lothian Birth Cohort 1936 for white matter integrity measures (volume, severity of white matter hyperintensities, tract integrity).
  • Assessed choice reaction time (CRT) using a 4-choice task.
  • Employed multiple regression analysis for data interpretation.

Main Results:

  • Increased volume and frontal severity of white matter hyperintensities correlated with higher CRT IIV.
  • Measures of white matter tract integrity (fractional anisotropy, mean diffusivity) showed minimal association with CRT IIV.
  • Associations between hyperintensities and CRT IIV were no longer significant when controlling for mean CRT.

Conclusions:

  • IIV in CRT did not incrementally predict white matter integrity beyond mean response speed.
  • Findings contrast with some prior studies, emphasizing the need for further investigation into the relationship between RT variability and brain health.