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Binaural Speech Understanding With Bilateral Cochlear Implants in Reverberation
1Speech-Language-Hearing: Sciences & Disorders, University of Kansas, Lawrence.
American Journal of Audiology
|December 28, 2017
Summary
Bilateral cochlear implant (CI) users experience reduced binaural advantages in reverberant environments. Reverberation significantly impedes speech understanding, particularly for those already struggling with hearing in everyday situations.
Area of Science:
- Audiology
- Neuroscience
- Biomedical Engineering
Background:
- Bilateral cochlear implants (CI) aim to restore hearing by stimulating both cochleae.
- Binaural hearing provides advantages like improved speech understanding in noise and sound localization.
- Reverberation, common in real-world environments, can degrade auditory signals and challenge binaural processing.
Purpose of the Study:
- To investigate binaural advantages in bilateral CI users under reverberant conditions.
- To compare the magnitude of binaural advantages in reverberant versus near-anechoic environments.
Main Methods:
- Ten postlingually deafened adults using bilateral Nucleus 5 or 6 CIs participated.
- Speech reception thresholds were measured in sound field across two reverberation conditions (0.06s and 0.6s).
- Listening conditions varied by ear (left, right, both) and noise spatial location (left, front, right).
Main Results:
- Head-shadow effect showed a strong positive impact in reverberation (0.6s RT).
- Spatial release from masking provided a weaker advantage, diminishing with increased reverberation.
- Binaural squelch and summation benefits were not statistically significant in the tested reverberant conditions.
Conclusions:
- Reverberation significantly impedes binaural speech understanding in bilateral CI users.
- The magnitude of binaural advantages is reduced in reverberant environments compared to less reverberant ones.
- CI recipients with existing hearing difficulties may experience less benefit from bilateral processors in reverberant settings.
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