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Brain morphometry in reading-disabled twins.

B F Pennington1, P A Filipek, D Lefly

  • 1University of Denver, CO 80208, USA.

Neurology
|September 17, 1999
PubMed
Summary
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Brain imaging reveals subtle differences in cortical development in individuals with reading disability (RD). While most brain structures show no size differences, the insula and anterior superior cortex are smaller in RD, with altered development not linked to ADHD.

Area of Science:

  • Neuroimaging
  • Developmental Neuroscience
  • Cognitive Neuroscience

Background:

  • Brain structural correlates of reading disability (RD) remain debated.
  • Previous studies have yielded inconsistent findings.
  • This study investigates a wider range of brain structures in the largest sample to date, controlling for key covariates.

Purpose of the Study:

  • To identify differences in brain structure in individuals with reading disability (RD) using MRI-based morphometry.
  • To compare brain volumes and cortical development patterns between individuals with and without RD.
  • To determine if observed differences are influenced by comorbid attention deficit hyperactivity disorder (ADHD).

Main Methods:

  • A case-control study involving 75 individuals with RD and 22 controls.

Related Experiment Videos

  • Participants were assessed using MRI-based morphometry to measure brain structure volumes.
  • Analyses included group-by-structure comparisons of neocortical, subcortical, and corpus callosum regions, controlling for age, gender, IQ, and ADHD status.

    • Main Results:

    • A significant group-by-structure interaction was found for neocortical subdivisions, indicating altered developmental patterns in RD.
    • The insula and anterior superior neocortex were smaller in the RD group, while the retrocallosal cortex was larger.
    • No significant differences were observed in subcortical or callosal structures between groups, even in subjects without ADHD.

    Conclusions:

    • Cortical development is subtly altered in individuals with reading disability, with specific regional differences observed.
    • Findings replicate and extend previous research on insular differences in RD.
    • These brain structure differences in RD are not attributable to comorbid ADHD.