Transmission properties of bone conducted sound: Measurements in cadaver heads
Transmission properties of bone conducted sound: Measurements in cadaver heads
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DOI：
10.1121/1.2005847
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发表时间：
2005-10-01
影响因子：
2.4
通讯作者：
Goode, RL
中科院分区：
文献类型：
--
作者：
Stenfelt, S;Goode, RL
在过去，只有少数研究用骨传导刺激测量耳蜗振动：在这些研究中使用干颅骨。本文介绍了骨传导声在人体头部的传输特性，测量了6具完整尸体头部在耳蜗角处的三维振动。在颅骨表面的27个位置和靠近耳蜗的2个位置进行刺激；在所有位置测量机械点阻抗。耳蜗峡部三个垂直方向的振动水平正常在5db以内。当刺激施加于同侧耳蜗时，随着耳蜗与刺激位置的距离增加，反应减弱，累积相位增加。当刺激在对侧时，没有明显的变化。在振动水平上，最佳刺激位置在靠近耳蜗的乳突上；最严重的是颅骨中线。当频率高达700 Hz时，经颅透射率接近0 dB；以上以12 dB/ 10年的速率下降。脑电波在颅底的传输频率在2千赫以上是非色散的，而在颅顶则随频率变化。(c) 2005年美国声学学会。
In the past, only a few investigations have measured vibration at the cochlea with bone conduction stimulation: dry skulls were used in those investigations. In this paper, the transmission properties of bone conducted sound in human head are presented, measured as the three-dimensional vibration at the cochlear promontory in six intact cadaver heads. The stimulation was provided at 27 positions on the skull surface and two close to the cochlea; mechanical point impedance was measured at all positions. Cochlear promontory vibration levels in the three perpendicular directions were normally within 5 dB. With the stimulation applied on the ipsilateral side, the response decreased, and the accumulated phase increased, with distance between the cochlea and the excitation position. No significant changes were obtained when the excitations were on the contralateral side. In terms of vibration level, the best stimulation position is on the mastoid close to the cochlea; the worst is at the midline of the skull. The transcranial transmission was close to 0 dB for frequencies up to 700 Hz; above it decreased at 12 dB/decade. Wave transmission at the skull-base was found to be nondispersive at frequencies above 2 kHz whereas it altered with frequency at the cranial vault. (c) 2005 Acoustical Society of America.