Bone Conduction Thresholds and Skull Vibration Measured on the Teeth during Stimulation at Different Sites on the Human Head
Bone Conduction Thresholds and Skull Vibration Measured on the Teeth during Stimulation at Different Sites on the Human Head
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DOI：
10.1159/000314282
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发表时间：
2011-01-01
影响因子：
1.6
通讯作者：
Probst, R.
中科院分区：
文献类型：
--
作者：
Ito, T.;Roeoesli, C.;Probst, R.
振动听觉刺激或骨传导（BC）通过头部的骨和非骨结构到达内耳，但BC的不同途径的贡献仍然不清楚。在这项研究中，BC阈值在几个不同的位置，包括眼睛的刺激进行了评估，而颅骨振动的幅度进行了测量的人类受试者的门牙，无论是正常的听力两侧或单侧耳聋与正常听力的另一侧。如先前的工作所报道的，在同侧乳突和同侧颞区刺激的BC阈值低于在其他部位刺激的BC阈值。在同侧乳突和同侧颞区刺激的较低阈值与在牙齿上测量的颅骨振动的较高振幅相匹配，但仅在低于1 kHz的频率下。在0.25- 4kHz的频率范围内，在眼睛处刺激的阈值显著高于在骨骼部位处刺激的阈值。虽然在眼睛处刺激期间在牙齿上测量的颅骨振动对于低频率是低的，但是在3 kHz和4 kHz处测量到显著的骨振动，这表明对于软组织或骨部位刺激的BC的不同路径。这一发现与头骨振动和BC听力阈值之间的直接关系相矛盾。版权所有（C）2010 S. Karger AG，巴塞尔
Vibratory auditory stimulation or bone conduction ( BC) reaches the inner ear through both osseous and non-osseous structures of the head, but the contribution of the different pathways of BC is still unclear. In this study, BC thresholds in response to stimulation at several different locations including the eye were assessed, while the magnitudes of skull bone vibrations were measured on the front teeth in human subjects with either normal hearing on both sides or unilateral deafness with normal hearing on the other side. The BC thresholds with stimulation at the ipsilateral mastoid and ipsilateral temporal region were lower than the BC thresholds with stimulation at the other sites, as reported by previous works. The lower thresholds with stimulation at the ipsilateral mastoid and ipsilateral temporal region matched higher amplitudes of skull bone vibrations measured on the teeth, but only at frequencies below 1 kHz. With stimulation at the eye, the thresholds were significantly higher than those with stimulation at the bony sites in the frequency range of 0.25-4 kHz. While skull bone vibrations as measured on the teeth during stimulation at the eye were low for low frequencies, significant bone vibrations were measured at 3 and 4 kHz, indicating different pathways for BC for either the soft tissue or bony site stimulation. This finding contradicts a straightforward relationship between vibrations of the skull bones and BC hearing thresholds. Copyright (C) 2010 S. Karger AG, Basel