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- Title
Spatial Release From Masking in Adults With Bilateral Cochlear Implants: Effects of Distracter Azimuth and Microphone Location.
- Authors
Davis, Timothy J.; Gifford, René H.
- Abstract
Purpose: The primary purpose of this study was to derive spatial release from masking (SRM) performance-azimuth functions for bilateral cochlear implant (CI) users to provide a thorough description of SRM as a function of target/distracter spatial configuration. The secondary purpose of this study was to investigate the effect of the microphone location for SRM in a within-subject study design. Method: Speech recognition was measured in 12 adults with bilateral CIs for 11 spatial separations ranging from -90° to +90° in 20° steps using an adaptive block design. Five of the 12 participants were tested with both the behind-the-ear microphones and a T-mic configuration to further investigate the effect of mic location on SRM. Results: SRM can be significantly affected by the hemifield origin of the distracter stimulus--particularly for listeners with interaural asymmetry in speech understanding. The greatest SRM was observed with a distracter positioned 50° away from the target. There was no effect of mic location on SRM for the current experimental design. Conclusion: Our results demonstrate that the traditional assessment of SRM with a distracter positioned at 90° azimuth may underestimate maximum performance for individuals with bilateral CIs.
- Subjects
AUDITORY masking; LISTENING comprehension; DISTRACTION; MICROPHONES; COCHLEAR implants
- Publication
Journal of Speech, Language & Hearing Research, 2018, Vol 61, Issue 3, p752
- ISSN
1092-4388
- Publication type
Article
- DOI
10.1044/2017_JSLHR-H-16-0441