Study of mechanical motions in the basal region of the chinchilla cochlea
Study of mechanical motions in the basal region of the chinchilla cochlea
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DOI：
10.1121/1.429404
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发表时间：
2000-06-01
影响因子：
2.4
通讯作者：
Recio, A
中科院分区：
文献类型：
--
作者：
Rhode, WS;Recio, A
从1 - 4毫米的基底区域的灰鼠耳蜗的测量表明，在钩区（12 - 18 kHz）的基底膜振动基本上是因为它更顶端，在5 - 9 kHz的区域。也就是说，在特征频率的区域中的压缩非线性、振幅依赖的相位变化以及相对于镫骨运动的增益可以在低水平下达到近10 000。该区域的神经纤维在阈值（20 dB SPL）下的位移近似于2 nm。在个体动物的纵向和径向的几个位置进行测量。结果表明，径向运动相位的变化很小，没有高阶振动模式的迹象。纵向研究的数据表明，随着刺激水平的增加，最大值的位置向底部移动。耳蜗放大器在特征频率位置周围的2 - 3 mm区域上延伸。(C)2000年美国声学学会。【S0001 - 4966（00）01506-X】。
Measurements from the 1-4-mm basal region of the chinchilla cochlea indicate the basilar membrane in the hook region (12-18 kHz) vibrates essentially as it does more apically, in the 5-9-kHz region. That is, a compressive nonlinearity in the region of the characteristic frequency, amplitude-dependent phase changes, and a gain relative to stapes motion that can attain nearly 10 000 at low levels. The displacement at threshold for auditory-nerve fibers in this region (20 dB SPL) was similar to 2 nm. Measurements were made at several locations in individual animals in the longitudinal and radial directions. The results indicate that there is little variability in the phase of motion radially and no indication of higher-order modes of vibration. The data from the longitudinal studies indicate that there is a shift in the location of the maximum with increasing stimulus levels toward the base. The cochlear amplifier extends over a 2-3-mm region around the location of the characteristic frequency. (C) 2000 Acoustical Society of America. [S0001-4966(00)01506-X].