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Suprathreshold auditory processes in listeners with normal audiograms but extended high-frequency hearing lossa)
Srikanta K Mishra1, Qian-Jie Fu2, John J Galvin3
1Department of Speech, Language and Hearing Sciences, The University of Texas at Austin, Austin, Texas 78712, USA.
The Journal of the Acoustical Society of America
|May 3, 2023
Summary
Extended high-frequency (EHF) hearing loss, common in young adults, may impact standard hearing abilities. Research suggests EHF loss is linked to poorer spectral resolution at 4 kHz, even with normal audiograms.
Area of Science:
- Audiology
- Psychoacoustics
- Hearing Science
Background:
- Extended high-frequency (EHF) hearing loss (>8 kHz) is prevalent in young adults.
- This EHF loss may lead to difficulties in understanding speech, particularly in noisy environments.
- The impact of EHF hearing loss on fundamental psychoacoustic processes remains largely unexplored.
Purpose of the Study:
- To investigate the relationship between EHF hearing loss and auditory resolution in standard audiometric frequencies.
- To determine if EHF hearing loss is associated with deficits in temporal and spectral resolution.
- To test the hypothesis that EHF hearing loss compromises auditory processing in the typical hearing range.
Main Methods:
- Participants with and without EHF loss, but normal audiograms, were recruited.
- Temporal resolution was assessed using amplitude modulation detection thresholds (AMDTs) at 0.5 kHz and 4 kHz.
- Spectral resolution was evaluated via frequency change detection thresholds (FCDTs) at 0.5 kHz and 4 kHz.
Main Results:
- AMDTs showed a significant increase with a 4 kHz carrier frequency compared to 0.5 kHz, irrespective of EHF loss.
- No significant effect of EHF loss was observed on AMDTs.
- FCDTs at 0.5 kHz were unaffected by EHF loss, but significantly higher at 4 kHz for individuals with EHF loss.
Conclusions:
- EHF hearing loss may compromise spectral auditory resolution at 4 kHz.
- These findings suggest potential impacts on standard hearing despite normal audiometric results.
- Auditory resolution in the standard frequency range could be affected by undetected EHF hearing loss.
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