頭蓋振動と骨導聴力に関する研究

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タイトル別名
  • STUDY ON THE VIBRATION OF THE HEAD AND THEHEARING ACUITY OF BONE CONDUCTION
  • 頭蓋振動と胃導聴力に関する研究
  • トウガイ シンドウ ト イドウチョウリョク ニ カンスル ケンキュウ

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The bone conduction thresholds of unilateral deafnesses were measured over the different 200 partitions of the head and the face (Fig. 1).<br> Then the cancellation between bone conducted and air conducted tones, that was similar to Barany's mehtod (Acta Otol. suppl. 26, 1938), was executed on normal subjects to estimate the phase and mode in the vibration of the head (Fig. 2).<br> Continuously to these experiments, the angle between the rotatory axis of ossicular vibra-tion of the middle ear and the sagittal plane of the head was observed on the temporal bone (Fig. 8).<br> The results were as follows;<br> 1) It was seen that the thresholds of bone conduction of the head at 250 and 500cps were lowered in the temporal portion and they were elevated at difference of 15 dB in the middle plane of the head from the forehead to the vertex and occiput (Fig. 4, 5, 6).<br> The difference of the bone conduction thresholds over every partition of the head was diminished in 1000 cps and the threshold of forehead or occiput was lowered equally to that of temporal portion.<br> In 2000 cps, the distribution of the thresholds has been complicated and the thresholds of normal side were better 10 dB than the deaf side.<br> 2) The phase of the bone conducted tone of the head, at 500 cps, reached each other to the maximal phase difference at the temporal portion on both side.<br> At 1000cps, however, the maximal phase difference has been seen between the middle plane of the head and the temporal portition, but the phase of bilateral temporal portion had no difference between them (Fig. 7).<br> 3) It was observed on the temporal bone that the rotatory axis of ossicular chain crossed to the middle sagittal plane of the head with the degrees of 16 to 24 and the intersecting point was in the frontal direction of the head. In horizontal dirction the rotatory axis crossed to the German. horizontal plane with the degrees of 0 to 5 (Fig. 9, Tabl. 1).<br> 4) Concerning the results above mentioned, it was thought that there was the approxi-mate relation between the vibrational pattern of the head and the hearing acuity of bone con-duction at 250, 500 and 1000 cps (Fig. 10).<br> The distribution of the thresholds at 2000 cps, however, could not be applied to this for-mula.<br> 5) The cross perception of sound on the head found by Lucae, has been not clear over 500 cps but the threshold of the vertex of the deaf side at 250 and 500 cps, was lowered 5 to 10dB than the normal side (Fig. 4, 5).

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