Is dyslexia a brain disorder?

Athanassios Protopapas, Rauno Parrila

    Research output: Contribution to journalArticlepeer-review

    41 Citations (Scopus)
    68 Downloads (Pure)


    Specific word reading difficulty, commonly termed ‘developmental dyslexia’, refers to the low end of the word reading skill distribution but is frequently considered to be a neurodevelopmental disorder. This term implies that brain development is thought to be disrupted, resulting in an abnormal and dysfunctional brain. We take issue with this view, pointing out that there is no evidence of any obvious neurological abnormality in the vast majority of cases of word reading difficulty cases. The available relevant evidence from neuroimaging studies consists almost entirely of correlational and group-differences studies. However, differences in brains are certain to exist whenever differences in behavior exist, including differences in ability and performance. Therefore, findings of brain differences do not constitute evidence for abnormality; rather, they simply document the neural substrate of the behavioral differences. We suggest that dyslexia is best viewed as one of many expressions of ordinary ubiquitous individual differences in normal developmental outcomes. Thus, terms such as “dysfunctional” or “abnormal” are not justified when referring to the brains of persons with dyslexia.
    Original languageEnglish
    Article number61
    Pages (from-to)1-18
    Number of pages18
    JournalBrain Sciences
    Issue number4
    Publication statusPublished - 2018

    Bibliographical note

    Copyright the Author(s) 2018. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.


    • dyslexia
    • reading difficulty
    • brain
    • neurodevelopmental disorder
    • neurological disorder
    • neuroimaging
    • fMRI


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