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Chinchilla middle ear transmission matrix model and middle-ear flexibility
Michael E Ravicz1, John J Rosowski1
1Eaton-Peabody Laboratory, Massachusetts Eye & Ear Infirmary, 243 Charles Street, Boston, Massachusetts 02114, USA.
The Journal of the Acoustical Society of America
|June 11, 2017
Summary
A new acoustic transmission matrix models middle ear function in chinchillas, independent of cochlear load. This provides a more robust understanding of sound transmission from the ear canal to the cochlea.
Area of Science:
- Acoustics
- Bioengineering
- Auditory Neuroscience
Background:
- The middle ear (ME) transforms acoustic signals, crucial for hearing.
- Acoustic two-port transmission matrices can describe ME function.
- Previous models often required assumptions or reverse measurements.
Purpose of the Study:
- To present an acoustic transmission matrix for chinchilla middle ear function.
- To compute this matrix from forward ME function measurements.
- To avoid assumptions about inner ear state or reverse sound transmission.
Main Methods:
- Utilized measurements of input admittance (YTM), ME pressure gain (GMEP), ME velocity transfer function (HV), and cochlear input admittance (YC).
- Calculated the transmission matrix from these forward measurements in chinchillas.
- Did not require assumptions on inner ear status or reverse ME measurements.
Main Results:
- A transmission matrix describing chinchilla ME function was computed.
- The matrix element values align with physical constraints and the anatomical ME transformer ratio.
- Results are consistent across multiple forward measurements without needing reverse direction data.
Conclusions:
- The presented transmission matrix offers a robust description of middle ear acoustic function.
- This model is independent of the cochlear load and measurement direction.
- Discrepancies with prior estimates may stem from differences in middle ear flexibility.
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