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Related Experiment Videos

White matter volume predicts reaction time instability.

Kristine B Walhovd1, Anders M Fjell

  • 1University of Oslo, Institute of Psychology, POB 1094 Blindern, 0317 Oslo, Norway. k.b.walhovd@psykologi.uio.no

Neuropsychologia
|April 13, 2007
PubMed
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Intra-individual variability in reaction time (sdRT), not just average speed, is linked to white matter integrity. This brain measure predicts cognitive performance more than average reaction time.

Area of Science:

  • Neuropsychology
  • Cognitive Psychology
  • Neuroimaging

Background:

  • Information processing speed is crucial in cognitive psychology and neuropsychology.
  • Previous research focused on mean reaction time (RT), neglecting intra-individual variability (sdRT).
  • Intra-individual inconsistency (sdRT) is linked to age, neurological disorders, intelligence, and cognitive test performance but not neuroanatomy.

Purpose of the Study:

  • To investigate the neuroanatomical correlates of intra-individual variability in reaction time (sdRT).
  • To explore the relationship between white matter (WM) and gray matter (GM) volumes and both sdRT and mean RT.
  • To understand the neurobiological basis of intra-individual variability in cognitive processing.

Main Methods:

  • Correlated white matter (WM) and gray matter (GM) volumes from MRI scans with sdRT and mean RT from a visual oddball task.

Related Experiment Videos

  • Analyzed data from 71 healthy participants aged 20-88 years.
  • Utilized a path model to examine relationships between age, sdRT, WM volume, and cognitive performance.

    • Main Results:

    • Confirmed negative correlations between sdRT and WM volume, and between mean RT and cortical GM volume.
    • The correlation between sdRT and WM volume remained significant independently of age, gender, and mean RT.
    • sdRT was a stronger predictor of performance intelligence than mean RT, with WM volume influencing performance via sdRT.

    Conclusions:

    • sdRT and mean RT may have distinct neuroanatomical correlates.
    • sdRT is significantly associated with white matter characteristics.
    • Intra-individual variability in reaction time is a meaningful indicator of cognitive function and brain structure.