When all hypotheses are right: A multifocal account of dyslexia

Cyril Pernet, Jesper Andersson, Eraldo Paulesu, Jean Francois Demonet

Research output: Contribution to journalArticlepeer-review


Many hypotheses have been proposed about the brain underpinnings of developmental dyslexia, but none of them accommodates the variable deficits observed. To address the issue of anatomical deficits in dyslexia; total and partial volumes, lateralization indices (LI), and local gray matter volumes (LGMV) were measured. Analyses were performed in large samples of control and dyslexic subjects, and in correlation with their performance on phonological, reading, and spelling tests. Results indicate an absence of net differences in terms of volumes but significant continuities and discontinuities between groups in their correlations between LI, LGMV, and performances. Structural connectivity also highlighted correlations between areas showing (dis)continuities between control and dyslexic subjects. Overall, our data put forward the idea of a multifocal brain abnormalities in dyslexia with a major implication of the left superior temporal gyrus, occipital-temporal cortices, and lateral/medial cerebellum, which could account for the diverse deficits predicted by the different theories.

Original languageEnglish
Pages (from-to)2278-2292
Number of pages15
JournalHuman Brain Mapping
Issue number7
Publication statusPublished - Jul 2009


  • Cerebellum
  • Dyslexia
  • Fusiform gyrus
  • Reading
  • Superior temporal gyrus
  • VBM

ASJC Scopus subject areas

  • Clinical Neurology
  • Anatomy
  • Neurology
  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

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