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The Effects of Length and Lexicality on Lexical Decision Using Kana Words in Normal Developmental Children

  • Kurokawa Suzuko
    Graduate School of Comprehensive Human Sciences, University of Tsukuba
  • Sambai Ami
    Faculty of Human Sciences, University of Tsukuba NPO Corporation LD/Dyslexia Centre
  • Uno Akira
    Graduate School of Comprehensive Human Sciences, University of Tsukuba Faculty of Human Sciences, University of Tsukuba NPO Corporation LD/Dyslexia Centre

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Other Title
  • 典型発達児における仮名文字を用いた語彙判断時の文字長効果と語彙性効果

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Abstract

We investigated the effects of length and lexicality on the lexical decision task using Kana words and pseudo-homophones (i.e., nonwords that sound like real words) in children with normal reading. Participants in this study were all Japanese-speaking primary school children. They were divided into two experimental groups of different ages. The younger group consisted of second and third graders, and the older group consisted of fifth and sixth graders. As we controlled both word and pseudo-homophone stimuli for the same sound, we were able to suppose the existence of orthographic knowledge if we found lexical effect. The results revealed that RTs were significantly shorter with the word stimuli than with the pseudo-homophone stimuli. Furthermore no length effect was found in either group using Hiragana. These results appear to show that the children judged lexicality using orthographic information and processed each letter which constituted each stimulus in parallel. The recognition of lexicality effect and no length effect may suggest that children judged lexicality by orthographic lexicon in the lexical route according to the Dual Route Cascaded model.

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