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Extended high-frequency hearing and suprathreshold neural synchrony in the auditory brainstem
Jithin Raj Balan1,2, Srikanta K Mishra1, Hansapani Rodrigo3
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
|March 4, 2025
Summary
Elevated hearing thresholds in extended high frequencies (EHFs) do not impact auditory brainstem responses at lower frequencies in individuals with normal hearing. This suggests that EHF hearing loss does not disrupt neural processing in the auditory brainstem for standard frequencies.
Area of Science:
- Audiology
- Neuroscience
- Hearing Science
Background:
- Elevated hearing thresholds in extended high frequencies (EHFs) (>8 kHz) are linked to reduced speech-in-noise recognition, even with normal audiograms.
- The effect of EHF hearing loss on auditory brainstem neural processing remains unclear.
Purpose of the Study:
- To determine if elevated EHF thresholds affect neural processing at lower frequencies (<8 kHz) in individuals with normal audiograms.
- To investigate the relationship between EHF hearing sensitivity and auditory brainstem response (ABR) metrics.
Main Methods:
- Auditory brainstem responses (ABRs) were recorded in 45 participants with clinically normal hearing.
- The protocol focused on obtaining robust wave I of the ABR at a suprathreshold level (80 dB nHL).
- Statistical analyses adjusted for age, sex, and standard hearing thresholds (0.25-8 kHz).
Main Results:
- No significant association was found between EHF pure tone average and ABR metrics (wave I, V amplitude, I-V latency, III, V latency) at either tested rate.
- Significant sex effects were observed for specific ABR measures, dependent on the stimulation rate.
- Elevated EHF hearing thresholds did not significantly alter brainstem processing for frequencies below 8 kHz.
Conclusions:
- The study concludes that elevated EHF hearing thresholds do not significantly impact neural processing in the auditory brainstem for lower frequencies.
- Findings suggest that auditory brainstem function for standard audiometric frequencies is preserved despite EHF hearing loss in individuals with normal audiograms.
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