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首页> 美国卫生研究院文献>The Journal of the Acoustical Society of America >Development of wide-band middle ear transmission in the Mongolian gerbil
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Development of wide-band middle ear transmission in the Mongolian gerbil

机译：蒙古沙鼠宽带中耳传输技术的发展

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摘要

Stapes vibrations were measured in deeply anesthetized adult and neonatal (ages: 14 to 20 days) Mongolian gerbils. In adult gerbils, the velocity magnitude of stapes responses to tones was approximately constant over the entire frequency range of measurements, 1 to 40 kHz. Response phases referred to pressure near the tympanic membrane varied approximately linearly as a function of increasing stimulus frequency, with a slope corresponding to a group delay of 30 μs. In neonatal gerbils, the sensitivity of stapes responses to tones was lower than in adults, especially at mid-frequencies (e.g., by about 15 dB at 10–20 kHz in gerbils aged 14 days). The input impedance of the adult gerbil cochlea, calculated from stapes vibrations and published measurements of pressure in scala vestibuli near the oval window [E. Olson, J. Acoust. Soc. Am. >103, 3445–3463 (1998)], is principally dissipative at frequencies lower than 10 kHz.Conclusions(a) middle-ear vibrations in adult gerbils do not limit the input to the cochlea up to at least 40 kHz, i.e., within 0.5 oct of the high-frequency cutoff of the behavioral audiogram; and (b) the results in both adult and neonatal gerbils are inconsistent with the hypothesis that mass reactance controls high-frequency ossicular vibrations and support the idea that the middle ear functions as a transmission line.
机译：在深麻醉的成年和新生儿（年龄：14至20天）的蒙古沙鼠中测量药带振动。在成年沙鼠中，骨对音调的响应速度幅度在1至40 kHz的整个测量频率范围内大致恒定。响应于鼓膜附近压力的响应阶段随刺激频率的增加而呈线性变化，其斜率对应于30μs的群延迟。在新生儿沙鼠中，音对音调反应的敏感度低于成人，特别是在中频时（例如，在14天的沙鼠中，在10–20 kHz时，约15 dB）。成年沙鼠耳蜗的输入阻抗，是通过骨振动和椭圆形窗附近的前庭vest骨中压力的公开测量值[E.奥尔森，J。Acoust。 Soc。上午。 > 103 ，3445–3463（1998）]，其主要耗散频率低于10 kHz。结论（a）成年沙鼠的中耳振动不会将耳蜗的输入限制到至少40 kHz，即行为听力图高频截止的0.5 oct之内； （b）在成年和新生儿沙鼠中的结果均与质量电抗控制高频听骨振动并支持中耳作为传输线这一观点的假设相矛盾。

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