Verbal IQ Scores of Hearing-Impaired Subjects Trained by the Kanazawa Method

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  • 金沢方式による言語指導を受けた聴覚障害児・者の言語性知能

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Abstract

Speech and language training for deaf children is performed at Kanazawa University Hospital using the Kanazawa Method, which consists of reception and production training in sign language along with auditory/oral language and written language training. The present investigation was undertaken to explore the verbal IQ scores of 30 hearing-impaired subjects who were trained by the Kanazawa Method before entering elementary school. The subjects were 10 males and 20 females, ranging in age from 9 to 36 with a median age of 16. The median of the average hearing level of the better ear at the time of this study was 91.5 dB. There were 14 subjects with hearing below 89 dB and 16 subjects with hearing above 90 dB. Verbal IQ scores were evaluated using WISC-III WAIS-R. The results obtained were as follows. (i) Eighty percent of the subjects had a VIQ of 85 or higher. (ii) No statistically significant VIQ difference was found between the group up to 89 dB and the group above 90 dB, and 75 percent of the severely hearing-impaired subjects whose average hearing level was above 90 dB had a VIQ of 85 or higher. (iii) No statistically significant VIQ correlation was found with age at the onset of training. These results suggest that early presentation of written language is effective in the acquisition of verbal intelligence.

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