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Updated: Apr 14, 2026
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Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention
Published on: December 20, 2024
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Interaural level difference cues determine sound source localization by single-sided deaf patients fit with a
Michael F Dorman1, Daniel Zeitler, Sarah J Cook
1Department of Speech and Hearing Science, Arizona State University, Tempe, Ariz., USA.
Audiology & Neuro-Otology
|April 22, 2015
Summary
Cochlear implants improve sound localization for single-sided deafness (SSD) patients. SSD patients with cochlear implants (SSD-CI) show functional abilities, relying on interaural level differences (ILDs) for localization.
Area of Science:
- Audiology
- Neuroscience
- Biomedical Engineering
Background:
- Single-sided deafness (SSD) presents challenges in sound source localization.
- Cochlear implants (CI) are used to treat hearing loss, but their impact on spatial hearing in SSD is an area of ongoing research.
- Understanding the role of binaural cues, such as interaural level differences (ILDs) and interaural time differences (ITDs), is crucial for spatial hearing.
Purpose of the Study:
- To investigate sound source localization abilities in listeners with single-sided deafness fitted with a cochlear implant (SSD-CI).
- To compare localization performance between SSD-CI listeners, listeners with normal hearing, and listeners with bimodal hearing.
- To determine the reliance on ILD and ITD cues for sound source localization in SSD-CI patients.
Main Methods:
- Utilized filtered noise bands to manipulate listener access to ILDs and ITDs during a sound source localization task.
- Recruited three groups of listeners: those with SSD-CI, those with normal hearing, and those with bimodal hearing (CI in one ear, acoustic hearing in the other).
- Assessed localization performance across different listening conditions and compared results between groups.
Main Results:
- Sound source localization was significantly better in the SSD-CI condition compared to the SSD condition without a CI.
- SSD-CI patients demonstrated a reliance on ILD cues for effective sound source localization.
- Functional localization abilities were observed in SSD-CI patients within 1-3 months post-device activation, with performance generally better than bimodal CI users but poorer than normal-hearing listeners.
Conclusions:
- Cochlear implantation in individuals with single-sided deafness enhances sound source localization capabilities.
- Interaural level differences (ILDs) are key binaural cues utilized by SSD-CI patients for spatial hearing.
- While SSD-CI patients show functional localization, further improvements may be possible, as evidenced by one patient achieving normal localization levels.
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