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Updated: May 23, 2026

A Low Cost Setup for Behavioral Audiometry in Rodents
Published on: October 16, 2012
Behavioral hearing thresholds between 0.125 and 20 kHz using depth-compensated ear simulator calibration.
Jungmee Lee1, Sumitrajit Dhar, Rebekah Abel
1The Roxelyn and Richard Pepper Department of Communication Sciences and Disorders, Northwestern University, Evanston, IL 60208, USA. jmlee6@northwestern.edu
This study developed a new calibration method to accurately measure hearing thresholds across a wide frequency range. The findings reveal age-related hearing changes, especially at higher frequencies, and suggest previous gender differences might be calibration artifacts.
Area of Science:
- Audiology
- Hearing Science
- Biomedical Engineering
Background:
- Accurate hearing threshold measurement is crucial for diagnosing hearing loss.
- Previous methods for extended high-frequency hearing assessment (>8 kHz) lacked clinical feasibility and accuracy.
- Variations in ear canal acoustics and probe insertion depth complicate accurate sound level calibration.
Purpose of the Study:
- To establish behavioral hearing thresholds from 0.125 to 20 kHz in a large adult population (10-65 years).
- To implement a clinically feasible calibration method to account for variations in insert sound source distance.
- To overcome limitations of previous calibration techniques in extended high-frequency audiometry.
Main Methods:
- A novel depth-compensated ear simulator-based calibration method was used.
- Hearing thresholds were measured using a modified Békésy technique in 352 subjects (10-65 years).
- Stimulus levels were individually tailored based on otoacoustic emission probe insertion depth estimates.
Main Results:
- Hearing thresholds at extended high frequencies ( >8 kHz) showed significant sensitivity to age-related auditory changes.
- No significant gender differences in average hearing thresholds were observed across most frequencies.
- Test-retest reliability (5-10 dB SD) was comparable to similar techniques and better than standard clinical procedures.
Conclusions:
- The developed calibration method and modified Békésy technique enable reliable hearing threshold measurement across the full human hearing range.
- Extended high-frequency hearing is susceptible to subtle age-related changes not detected by standard audiometry (≤8 kHz).
- Reported gender differences in hearing may stem from ear canal acoustics and calibration, not inherent sensitivity differences.
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