Related Experiment Video
Updated: Mar 18, 2026
04:32
Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention
Published on: December 20, 2024
958
Spatial hearing adaptation in congenital and acquired single-sided deafness
Sebastian A Ausili1, Sandra M Prentiss1, John J Sheets1
1Department of Otolaryngology, University of Miami Health System, Miami, FL, United States.
Frontiers in Neuroscience
|March 16, 2026
Summary
Congenital single-sided deafness (SSDc) shows better adaptation than acquired SSD (SSDa). Cochlear implantation (CI) improves horizontal localization and processing speed, but vertical deficits remain in all SSD groups.
Area of Science:
- Auditory Neuroscience
- Neuroscience
- Audiology
Background:
- Single-sided deafness (SSD) impairs spatial hearing by disrupting binaural integration and monaural spectral cue processing.
- Congenital (SSDc) and acquired (SSDa) SSD offer insights into cortical adaptation, while cochlear implantation (CI) can partially restore binaural hearing.
Purpose of the Study:
- To compare localization performance and response promptness in individuals with SSDc, SSDa, and SSD with CI.
- To investigate the effects of auditory experience and hearing restoration on spatial hearing.
Main Methods:
- Thirty-one SSD listeners (SSDc, SSDa, SSD-CI) and 16 normal-hearing (NH) controls performed broadband noise localization tasks in azimuth and elevation.
- Analysis included localization accuracy, bias, mean absolute error (MAE), and response promptness using regression and mixed-effects models.
Main Results:
- SSD-CI listeners showed significantly better azimuth localization with CI on versus CI off (MAE 27° vs. 47°).
- SSDc listeners were more accurate than SSDa listeners, suggesting enhanced adaptation to early auditory deprivation.
- All SSD groups exhibited poor vertical localization and slower responses compared to NH controls; CI improved response speed.
Conclusions:
- Early auditory deprivation influences compensatory strategies in SSDc, while SSDa demonstrates limited adaptation.
- CI partially restores binaural cues, enhancing horizontal localization and processing efficiency, but vertical localization deficits persist.
- Auditory experience and hearing restoration interact to shape spatial hearing, informing individualized rehabilitation for unilateral hearing loss.
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