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Developmental Problems Relating to Lexical and Non-Lexical Processing in Reading Aloud of Kana Strings in Adults with Developmental Dyslexia

DOI 23 References Open Access
  • Sambai Ami
    Department of Cognitive Science, Macquarie University JSPS Postdoctoral Fellow for Research Abroad
  • Coltheart Max
    Department of Cognitive Science, Macquarie University
  • Uno Akira
    Gradute School of Comprehensive Human Sciences, University of Tsukuba NPO Corporation LD/Dyslexia Centre
  • Haruhara Noriko
    Department of Speech, Language and Hearing Therapy, Faculty of Health Sciences, Mejiro University NPO Corporation LD/Dyslexia Centre

Bibliographic Information

Other Title
  • 発達性読み書き障害成人例の仮名文字列音読における語彙処理と非語彙処理の発達的問題
  • —Using Effects of Length and Lexicality as Indicators—
  • ─文字長と語彙性効果を指標にして─

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Abstract

Our previous study found that children with developmental dyslexia used mainly non-lexical processing rather than lexical processing due to inefficient lexical processing during Kana word naming, and their non-lexical processing itself was also slow. The aim of this study was to confirm whether adults with developmental dyslexia also show the same problems, that is, inefficient lexical processing and slow non-lexical processing. To accomplish this aim, we ran a reading aloud experiment investigating effects of length and lexicality on reading latencies for strings of Kana characters. Participants were 7 adults with developmental dyslexia and 48 normal adults. The dyslexic group showed longer reading latencies than the normal group and a significantly large length effect irrespective of lexicality, findings that are compatible with results in our previous study. Therefore it is thought that the adults with developmental dyslexia in this study had the same problems in both lexical and non-lexical processing as the children with developmental dyslexia had in our previous study.

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