難聴幼児の言語発達と文字言語の役割

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  • The Role of Written Language in Language Developmentof the Hearing-impaired

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The training process of a severely hearing-impaired infant was reported. Acquisition of vocabulary, sentences and function words in oral language and written language were described from age 26 to 79 months. The effects of the written language on oral language development were discussed.<BR>The main results were as follows:<BR>1) Written language was easier to learn than oral language.<BR>2) Written language was transfered to oral language. The development of oral language overtook that of written language after 60 months.<BR>3) The combined number of receptive vocabulary words was about 4, 000 for written and oral language by 79 months. The number of expressive words was about 3, 000 in oral language by the same age.<BR>4) The subject showed much the same language development as that of normally hearing children in terms of vocabulary, sentences and function words at the age 72 months.<BR>These results suggest that teaching the written language to the hearing-impaired in early life not only provides a high level of literacy but also serves to promote the oral language.

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