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Better-ear glimpsing with symmetrically-placed interferers in bilateral cochlear implant users
Hongmei Hu1, Mathias Dietz1, Ben Williges1
1Medizinische Physik, Carl von Ossietzky Universität Oldenburg and Cluster of Excellence "Hearing4all," Küpkersweg 74, 26129, Oldenburg, Germany.
The Journal of the Acoustical Society of America
|May 3, 2018
Summary
Normal hearing listeners use "better-ear glimpsing" to improve speech clarity. Bilateral cochlear implant users also benefit from this strategy, especially with ideal monaural better-ear mask processing, despite reduced binaural cues.
Area of Science:
- Auditory Neuroscience
- Speech Perception
- Hearing Technology
Background:
- Normal hearing (NH) listeners utilize "better-ear glimpsing" for improved speech reception in noise by selecting favorable time-frequency segments.
- Ideal monaural better-ear mask (IMBM) processing can approximate binaural listening performance in NH listeners.
- Bilateral cochlear implant (BiCI) listeners may employ better-ear glimpsing but lack interaural phase differences.
Purpose of the Study:
- To compare the effectiveness of "better-ear glimpsing" and IMBM processing in NH and BiCI listeners across various noise conditions.
- To investigate the impact of spatial separation of interferers on speech reception thresholds.
- To evaluate the binaural benefit and IMBM processing advantage in BiCI listeners and NH listeners using a bilateral noise vocoder.
Main Methods:
- Speech reception thresholds were measured in NH and BiCI listeners with different interferer types and spatial configurations (co-located, ±60°, independent ears).
- Ideal monaural better-ear mask (IMBM) processing was applied with and without spatial separation.
- A bilateral noise vocoder simulation based on BiCI electrodograms was used in NH listeners.
Main Results:
- Both NH listeners with vocoder and BiCI listeners exhibited significantly reduced binaural benefit from spatial separation compared to NH listeners.
- All groups, including BiCI listeners and NH listeners with vocoder, showed substantial improvements with IMBM processing.
- IMBM processing significantly enhanced speech reception in challenging listening conditions for both NH and BiCI listeners.
Conclusions:
- Spatial separation offers limited benefit for BiCI listeners and NH listeners with simulated CI processing.
- Ideal monaural better-ear mask (IMBM) processing is a crucial strategy for improving speech intelligibility in BiCI users.
- The findings highlight the importance of monaural processing strategies for hearing device users with impaired binaural hearing.
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