New evidence for morphological errors in deep dyslexia

Kathleen Rastle*, Lorraine K. Tyler, William Marslen-Wilson

*Corresponding author for this work

    Research output: Contribution to journalArticle

    17 Citations (Scopus)


    Morphological errors in reading aloud (e.g., sexist → sexy) are a central feature of the symptom-complex known as deep dyslexia, and have historically been viewed as evidence that representations at some level of the reading system are morphologically structured. However, it has been proposed (Funnell, 1987) that morphological errors in deep dyslexia are not morphological in nature but are actually a type of visual error that arises when a target word that cannot be read aloud (by virtue of its low imageability and/or frequency) is modified to form a visually similar word that can be read aloud (by virtue of its higher imageability and/or frequency). In the work reported here, the deep dyslexic patient DE read aloud lists of genuinely suffixed words (e.g., killer), pseudosuffixed words (e.g., corner), and words with non-morphological embeddings (e.g., cornea). Results revealed that the morphological status of a word had a significant influence on the production of stem errors (i.e., errors that include the stem or pseudostem of the target): genuinely suffixed words yielded more stem errors than pseudosuffixed words or words with non-morphological embeddings. This effect of morphological status could not be attributed to the relative levels of target and stem imageability and/or frequency. We argue that this pattern of data indicates that apparent morphological errors in deep dyslexic reading are genuinely morphological, and discuss the implications of these errors for theories of deep dyslexia.

    Original languageEnglish
    Pages (from-to)189-199
    Number of pages11
    JournalBrain and Language
    Issue number2
    Publication statusPublished - May 2006


    • Acquired dyslexia
    • Deep dyslexia
    • Morphological errors
    • Morphology
    • Reading aloud
    • Visual errors
    • Visual word recognition

    Fingerprint Dive into the research topics of 'New evidence for morphological errors in deep dyslexia'. Together they form a unique fingerprint.

    Cite this