自由音場における聴力検査

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タイトル別名
  • STUDY OF HEARING TEST IN FREE FIELD
  • 自由音場における聴力検査-間接骨伝導に就ての研究
  • ジユウ オンバ ニ オケル チョウリョク ケンサ-カンセツコツ デンドウ ニ シュウテ ノ ケンキュウ
  • On Indirect Bone Conduction

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In free field, part of sound penetrates the skull directly and reaches the inner ear through the bone.Author called this kind of sound transmission " indirect bone conduc- tion". Declining coefficient of sound in the indirect bone conduction was measured in 20 patients whose oneear was completely deaf and normal in the another side, and also in 15 cases with normal ears.Values obtained were from 45 db to 70 db. The author explained the method of hearing test in free field, in details and repor- ted the results on various types of deafness. In persons with normal hearing or perceptive deafness, hearing loss by the test in free field was almost completely equal to that obtained be the test using receiver.But in persons with severe conductive deafness showing 50-60db, hearing loss by the test in free field was smaller than that obtained by the test using, receiver, especially at higher frequencies. This phenomenon was explained that the indirect bone conduction might become stronger than the air conduction especially at higher frequencies when function of sound conducting system in the middle ear is damaged excessively.

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