Simultaneous measurements of ossicular velocity and intracochlear pressure leading to the cochlear input impedance in gerbil
Simultaneous measurements of ossicular velocity and intracochlear pressure leading to the cochlear input impedance in gerbil
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DOI：
10.1007/s10162-008-0115-1
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发表时间：
2008-06-01
影响因子：
2.4
通讯作者：
Olson, E. S.
中科院分区：
文献类型：
--
作者：
de La Rochefoucauld, O.;Decraemer, W. F.;Olson, E. S.
最近对沙鼠镫骨三维运动的测量表明，镫骨运动的活塞分量是耳蜗内压力的主要贡献者。为了使镫骨活塞运动和镫骨后的颅内压力之间的详细相关性，同时进行压力和运动测量。我们发现，阶前庭压力遵循活塞组成部分的镫骨速度高保真，加强我们以前的发现，活塞运动的镫骨是耳蜗的主要刺激。目前的数据使我们能够计算耳蜗输入阻抗和功率流到耳蜗。阻抗的幅度和相位在3 kHz至至少30 kHz的频率下都相当平坦，相位主要是电阻性的。在耳道中具有恒定刺激压力的情况下，镫骨处的耳蜗内压力先前已经被示出为在宽范围内随着频率近似平坦，并且将该结果与本发现耦合指示流入耳蜗的功率从约3 kHz到30 kHz是相当平坦的。所观察到的宽频带颅内压和功率流与沙土鼠的宽频带听力图一致。
Recent measurements of three-dimensional stapes motion in gerbil indicated that the piston component of stapes motion was the primary contributor to intra-cochlear pressure. In order to make a detailed correlation between stapes piston motion and intracochlear pressure behind the stapes, simultaneous pressure and motion measurements were undertaken. We found that the scala vestibuli pressure followed the piston component of the stapes velocity with high fidelity, reinforcing our previous finding that the piston motion of the stapes was the main stimulus to the cochlea. The present data allowed us to calculate cochlear input impedance and power flow into the cochlea. Both the amplitude and phase of the impedance were quite flat with frequency from 3 kHz to at least 30 kHz, with a phase that was primarily resistive. With constant stimulus pressure in the ear canal the intracochlear pressure at the stapes has been previously shown to be approximately flat with frequency through a wide range, and coupling that result with the present findings indicates that the power that flows into the cochlea is quite flat from about 3 to 30 kHz. The observed wide-band intracochlear pressure and power flow are consistent with the wide-band audiogram of the gerbil.