Effect of the cochlear microphonic on the limiting frequency of the mammalian ear.

Effect of the cochlear microphonic on the limiting frequency of the mammalian ear.
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DOI:
10.1121/1.2953317
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发表时间:
2008-09
期刊:
The Journal of the Acoustical Society of America
影响因子:
--
通讯作者:
Sul B
Sul B
中科院分区:
其他
文献类型:
--
作者:
Iwasa KH;Sul B

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Electromotility is a basis for cochlear amplifier which controls the sensitivity of the mammalian ear and contributes to its frequency selectivity. Because it is driven by the receptor potential, its frequency characteristics are determined by the low-pass RC filter intrinsic to the cell, which has the corner frequency about 1/10-th of the operating frequency. This filter significantly decreases the efficiency of electromotility as an amplifier. The present paper examines a proposal that the cochlear microphonic, the voltage drop across the extracellular medium by the receptor current, contributes to overcome this problem. It is found that this effect can improve the frequency dependence. However, this effect alone is too small to enhance the effectiveness of electromotility beyond 10 kHz in the mammalian ear.
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