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

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Author(s)

    • 三盃 亜美 Sambai Ami
    • 筑波大学人間系|NPO法人LD・Dyslexiaセンター Faculty of Human Sciences, University of Tsukuba|NPO Corporation LD/Dyslexia Centre
    • 宇野 彰 Uno Akira
    • 筑波大学大学院人間総合科学研究科|筑波大学人間系|NPO法人LD・Dyslexiaセンター Graduate School of Comprehensive Human Sciences, University of Tsukuba|Faculty of Human Sciences, University of Tsukuba|NPO Corporation LD/Dyslexia Centre

Abstract

本研究では,小学校低学年(2,3年生)と高学年(5,6年生)の典型発達児において,仮名文字による実在語と同音疑似語(文字列は実在しないが音韻列は実在する)の語彙判断に文字長と語彙性が及ぼす影響を検討した.本研究では,文字列情報の有無の違いによって語彙性の違いが生じるように,実在語と同音疑似語の音を等しく統制した.その結果,両学年に語彙性効果が認められたことから,低学年から語彙判断に対する文字列の視覚的な情報処理の関与が示された.また両学年のひらがなに文字長効果が認められなかったことから,文字列全体を系列的にではなく並列的に処理していると思われた.これらの現象は読みの二重経路モデルの枠組みにおいて説明可能であった.すなわち,語彙性効果が認められ,かつ文字長効果が有意でなかったことから,語彙経路における文字列辞書が関与する処理過程が示されたのではないかと思われた.

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.

Journal

  • The Japan Journal of Logopedics and Phoniatrics

    The Japan Journal of Logopedics and Phoniatrics 55(4), 326-332, 2014

    The Japan Society of Logopedics and Phoniatrics

Codes

  • NII Article ID (NAID)
    130004903381
  • Text Lang
    JPN
  • ISSN
    0030-2813
  • Data Source
    J-STAGE 
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