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Related Experiment Video

Updated: Jul 16, 2026

Scanning Dos and Don'ts: Using Magnetic Resonance Imaging in Awake Children Aged 3 to 5 Years to Assess Brain Structure and Function
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Functional and morphometric brain dissociation between dyslexia and reading ability.

Fumiko Hoeft1, Ann Meyler, Arvel Hernandez

  • 1Department of Psychology, Stanford University, Palo Alto, CA 94305-2130, USA. fumiko@stanford.edu

Proceedings of the National Academy of Sciences of the United States of America
|March 16, 2007
PubMed
Summary

Dyslexia involves both underactive (hypoactivation) and overactive (hyperactivation) brain areas. Hypoactivation is linked to dyslexia itself and brain structure, while hyperactivation relates to reading ability.

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Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Cognitive Science

Background:

  • Individuals with dyslexia often show atypical brain activation patterns, including hypoactivation and hyperactivation.
  • The interpretation of these differential activation patterns in relation to dyslexia has been unclear.

Purpose of the Study:

  • To investigate the relationship between hypoactivation and hyperactivation in dyslexia.
  • To differentiate between brain activity related to dyslexia and reading ability.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to measure brain activation during a rhyme judgment task.
  • Voxel-based morphometry (VBM) was employed to assess gray matter morphology.
  • Comparisons were made between dyslexic adolescents and both age-matched and reading-matched control groups.

Main Results:

  • Dyslexic adolescents exhibited hypoactivation in left parietal and fusiform cortices compared to both control groups.
  • Hyperactivation was observed in left frontal regions, caudate, and thalamus relative to age-matched controls, but not reading-matched controls.
  • Reduced gray matter volume was found in the left parietal region of dyslexic individuals compared to both control groups.

Conclusions:

  • Hypoactivation in dyslexia is associated with the condition itself and atypical brain morphology, independent of reading ability.
  • Hyperactivation in dyslexia reflects processes related to current reading performance, not dyslexia per se.
  • These findings help disentangle the neural correlates of dyslexia from those associated with reading proficiency.