Speed of processing of the visual-orthographic and auditory-phonological systems in adult dyslexics: The contribution of "asynchrony" to word recognition deficits

Zvia Breznitz, Maya Misra

    Research output: Contribution to journalArticlepeer-review

    Abstract

    This study investigated whether "asynchrony" in speed of processing (SOP) between the visual-orthographic and auditory-phonological modalities contributes to word recognition deficits among adult dyslexics. Male university students with a history of diagnosed dyslexia were compared to age-matched normal readers on a variety of experimental measures while event-related potentials and reaction time data were collected. Measures were designed to evaluate auditory and visual processing for non-linguistic (tones and shapes) and linguistic (phonemes and graphemes) low-level stimuli as well as higher-level orthographic and phonological processing (in a lexical decision task). Data indicated that adult dyslexic readers had significantly slower reaction times and longer P300 latencies than control readers in most of the experimental tasks and delayed P200 latencies for the lexical decision task. Moreover, adult dyslexics revealed a systematic SOP gap in P300 latency between the auditory/phonological and visual/orthographic processing measures. Our data support and extend previous work that found SOP asynchrony to be an underlying factor of childhood dyslexia. The present data suggests, however, that among adult dyslexics the between modalities asynchrony occurs at later processing stages than in children.

    Original languageEnglish
    Pages (from-to)486-502
    Number of pages17
    JournalBrain and Language
    Volume85
    Issue number3
    DOIs
    StatePublished - Jun 2003

    Keywords

    • Adult dyslexia
    • Asynchrony
    • Auditory
    • Electrophysiology
    • ERPs
    • Orthography
    • Phonology
    • Reading
    • Speed of processing
    • Timing
    • Visual

    ASJC Scopus subject areas

    • Experimental and Cognitive Psychology
    • Language and Linguistics
    • Linguistics and Language
    • Cognitive Neuroscience
    • Speech and Hearing

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