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A Low Cost Setup for Behavioral Audiometry in Rodents

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Testing coherent reflection in chinchilla: Auditory-nerve responses predict stimulus-frequency emissions.

Christopher A Shera¹, Arnold Tubis, Carrick L Talmadge

¹Eaton-Peabody Laboratory of Auditory Physiology, Massachusetts Eye and Ear Infirmary, 243 Charles Street, Boston, Massachusetts 02114, USA. shera@epl.meei.harvard.edu

The Journal of the Acoustical Society of America

|July 24, 2008

Summary

Coherent-reflection theory accurately predicts otoacoustic emissions by modeling wave backscattering in the cochlea. This study validates the theory using chinchilla auditory nerve data, confirming its effectiveness in explaining otoacoustic emission generation.

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Area of Science:

Auditory Neuroscience
Acoustics
Bioengineering

Background:

Otoacoustic emissions (OAEs) are sounds generated by the inner ear.
Stimulus-frequency OAEs (SFOAEs) and transient-evoked OAEs are crucial for hearing diagnostics.
The coherent-reflection theory posits OAE generation via backscattering of sound waves within the cochlea.

Purpose of the Study:

To comprehensively test the coherent-reflection theory using experimental data.
To compare model predictions with measured SFOAEs and basilar membrane (BM) responses in chinchillas.
To investigate the mechanisms underlying SFOAE generation across different cochlear frequencies.

Main Methods:

Utilized Wiener-kernel analysis of auditory-nerve responses to estimate near-threshold BM vibrations.
Employed an analytic expression for SFOAEs based on BM traveling waves and their complex wave number.
Developed an inversion procedure to derive the cochlear wave number from BM traveling wave data.

Main Results:

Excellent agreement between predicted and measured SFOAE phase-gradient delays and magnitude-frequency curves above 4 kHz.
Observed interference between short- and long-latency components in SFOAEs below 4 kHz.
Derived delay ratios (SFOAE delay/BM delay) between 1 and 2, consistent with traveling pressure-difference wave propagation.

Conclusions:

The coherent-reflection model successfully explains the dominant mechanisms of reflection-source OAE generation.
The findings support the role of traveling pressure-difference waves in cochlear forward and reverse energy propagation.
The study provides strong evidence for the coherent-reflection theory's validity in explaining otoacoustic emissions.