正常児と精薄児の周波数ひずみ語音検査
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概要
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The present investigation was designed to elucidate the auditory function concerning the effect of frequency filtration on the intelligibility of Japanese monosyllables in normal young children and the mentally retarded. The normal subjects were 20 children aged 4 and 5 years and 5 young adults. The mentally retarded subjects were 68 children aged between 8 and 18 years. Their mental ages ranged from 4 to 10 years and their IQs were from 45-84. Methods. The test material consisted of 20 phonetically balanced monosyllables in Japanese speech audiometry (67 AB list). From the tape recorder the test material was transmitted to an audiofilter. The filtered test material was fed into an audiometer and delivered to the subject with an earphone monoaurally. Three filtrations were used; low-pass filtration below 1200 Hz, high-pass one above 1700 Hz and band-pass one between 1200 and 2400 Hz. The test was carried out with pure tone audiometry, standard speech audiometry and filtered speech audiometry Results In the normal children, 50 dB sensation level was usually enough for 4 years old children and 40 dB for 5 years old ones to discriminate monosyllables on the standard (unfiltered) speech audiometry. It was found that 10 to 20 dB above the average level of the normal children was necessary for the mentally retarded to get correct discrimination. On the low-pass filtration, the discrimination scores were the poorest. They remained below 70%, in all subjects. In comparison with the low-pass filtration, the highpass one showed good discrimination scores for both normal subjects and the mentally retarded. In normal children, the result of the band-pass filtration was almost the same as that of the high-pass one. However, in the mentally retarded its result lay between that of the low-pass filtration and that of the high-pass one. Moreover, there was a gap in discrimination between the normal subjects and the mentally retarded in each filtration test, especially in the band-pass one. There was a very great variation in discrimination scores from one subject to another, especially in the mentally retarded. The clear developmental stage of discrimination ability was found in the normal subjects and not in the mentally retarded. There was no significant difference in discrimination ability between boys and girls as well as between left and right ears.
- 日本特殊教育学会の論文
- 1972-12-01
著者
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