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Updated: Jun 25, 2025
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Author Spotlight: Optimizing EAS with Long Electrodes for Enhanced Cochlear Coverage and Hearing Preservation
Published on: October 11, 2024
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Exploring the Influence of Extended High-Frequency Hearing on Cochlear Functioning at Lower Frequencies
Srikanta K Mishra1, Hansapani Rodrigo2, Jithin R Balan1
1Department of Speech, Language, and Hearing Sciences, The University of Texas at Austin.
Summary
Elevated extended high-frequency (EHF) hearing thresholds correlate with lower stimulus-frequency otoacoustic emissions (SFOAEs) in individuals with normal audiograms. This suggests EHF testing may reveal early cochlear changes impacting lower-frequency function.
Area of Science:
- Audiology
- Otoacoustic Emissions
- Cochlear Physiology
Background:
- Diminished basal cochlear function, indicated by elevated extended high-frequency (EHF) hearing thresholds, is linked to reduced otoacoustic emissions (OAEs).
- Stimulus-frequency otoacoustic emissions (SFOAEs) generated at low probe levels differ from distortion-product OAEs and may reflect different cochlear mechanisms.
Purpose of the Study:
- To investigate the impact of EHF hearing thresholds on SFOAEs measured at lower frequencies.
- To determine if EHF hearing status influences SFOAEs in individuals with normal conventional hearing.
Main Methods:
- Recorded SFOAEs from 45 participants with normal conventional hearing (0.25-8 kHz).
- Measured hearing thresholds at extended high frequencies (10, 12.5, 16 kHz).
- Analyzed SFOAE magnitudes and signal-to-noise ratios (SNRs) across various probe frequencies (1, 2, 4 kHz).
Main Results:
- SFOAE magnitudes and SNRs were significantly higher in ears with better EHF hearing.
- EHF hearing significantly predicted SFOAE measures, except for high-frequency SFOAE magnitudes.
- Hearing thresholds at probe frequencies did not significantly influence SFOAE variance.
Conclusions:
- Elevated EHF thresholds in individuals with normal audiograms may indicate diminished cochlear function in apical regions, as reflected by lower-frequency SFOAEs.
- EHF hearing thresholds are a valuable indicator of overall cochlear health and should be considered in audiological assessments.
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