Longitudinal study with oral and written language acquisition in hearing-impaired children

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This study evaluated the acquisition of oral (spoken) and written languages in the hearing impaired who had been trained from infancy by the Kanazawa method that incorporates written language teaching (focusing on the comprehension of written words) and were 9 years or older at the time of study. The Wechsler Intelligence Scales (WAIS-III and WISC-III) were employed to assess spoken language, and written language was evaluated from reading comprehension. of the 30 subjects, 80% scored within the normal range (85 and above) in Verbal IQ. There were 27 subjects out of 30 who were able to complete the reading ability test (comprehension test). There was a strong correlation between spoken language and the Wechsler Intelligent Scale (r=0.81). These findings suggested that the acquisition of spoken language was closely associated with that of the understanding of written words, and that the early introduction of written language was markedly effective in facilitating the acquisition of the Japanese language.