Speech and Hearing Bioscience and Technology Program, Harvard/MIT Division of Health Sciences and Technology, MIT, Cambridge, MA, USA.
Hear Res. 2013 Jul;301:66-71. doi: 10.1016/j.heares.2012.11.014. Epub 2012 Dec 1.
We investigated the contribution of the middle ear to the physiological response to bone conduction stimuli in chinchilla. We measured intracochlear sound pressure in response to air conduction (AC) and bone conduction (BC) stimuli before and after interruption of the ossicular chain at the incudo-stapedial joint. Interruption of the chain effectively decouples the external and middle ear from the inner ear and significantly reduces the contributions of the outer ear and middle ear to the bone conduction response. With AC stimulation, both the scala vestibuli Psv and scala tympani Pst sound pressures drop by 30-40 dB after the interruption. In BC stimulation, Psv decreases after interruption by about 10-20 dB, but Pst is little affected. This difference in the sensitivity of the BC induced Psv and Pst to ossicular interruption is not consistent with a BC response to ossicular motion, but instead suggests a significant contribution of an inner-ear drive (e.g., cochlear fluid inertia or compressibility) to the BC response. This article is part of a special issue entitled "MEMRO 2012".
我们研究了中耳对骨导刺激生理反应的贡献。我们测量了在镫骨-砧骨关节处中断听骨链前后，对空气传导（AC）和骨传导（BC）刺激的耳蜗内声压。中断听骨链可有效地将外耳和中耳与内耳分离，并显著降低外耳和中耳对骨导反应的贡献。在 AC 刺激下，镫骨足板前庭阶（scala vestibuli Psv）和镫骨鼓阶（scala tympani Pst）声压在中断后下降 30-40dB。在 BC 刺激下，中断后 Psv 下降约 10-20dB，但 Pst 影响较小。BC 诱导的 Psv 和 Pst 对听骨链中断的敏感性差异与听骨链运动的 BC 反应不一致，而是表明内耳驱动力（例如，耳蜗液惯性或可压缩性）对 BC 反应有显著贡献。本文是一个题为“MEMRO 2012”的特刊的一部分。
