Bimodal Hearing and Speech Perception With a Competing Talker PurposeThe objective of the study was to investigate the influence of bimodal stimulation upon hearing ability for speech recognition in the presence of a single competing talker.MethodSpeech recognition was measured in 3 listening conditions: hearing aid (HA) alone, cochlear implant (CI) alone, and both devices together (CI + HA). To ... Article
Article  |   October 01, 2011
Bimodal Hearing and Speech Perception With a Competing Talker
 
Author Affiliations & Notes
  • Markus Landwehr
    Jean-Uhrmacher-Institute for Clinical ENT-Research, University of Cologne, Germany
  • Moritz Hahn
    Institute of Medical Statistics, Informatics and Epidemiology, University of Cologne, Germany
  • Martin Walger
    Clinic of Otorhinolaryngology, Head and Neck Surgery, University of Cologne, Germany
  • Hasso von Wedel
    Clinic of Otorhinolaryngology, Head and Neck Surgery, University of Cologne, Germany
  • Hartmut Meister
    Jean-Uhrmacher-Institute for Clinical ENT-Research, University of Cologne, Germany
  • Correspondence to Verena Pyschny: verena.pyschny@uk-koeln.de
  • Editor: Robert Schlauch
    Editor: Robert Schlauch×
  • Associate Editor: Christopher Turner
    Associate Editor: Christopher Turner×
Article Information
Hearing & Speech Perception / Hearing Aids, Cochlear Implants & Assistive Technology / Hearing
Article   |   October 01, 2011
Bimodal Hearing and Speech Perception With a Competing Talker
Journal of Speech, Language, and Hearing Research, October 2011, Vol. 54, 1400-1415. doi:10.1044/1092-4388(2011/10-0210)
History: Received July 30, 2010 , Revised January 9, 2011 , Accepted January 21, 2011
 
Journal of Speech, Language, and Hearing Research, October 2011, Vol. 54, 1400-1415. doi:10.1044/1092-4388(2011/10-0210)
History: Received July 30, 2010; Revised January 9, 2011; Accepted January 21, 2011
Web of Science® Times Cited: 4

PurposeThe objective of the study was to investigate the influence of bimodal stimulation upon hearing ability for speech recognition in the presence of a single competing talker.

MethodSpeech recognition was measured in 3 listening conditions: hearing aid (HA) alone, cochlear implant (CI) alone, and both devices together (CI + HA). To examine the use of low-frequency cues, the competing masker voice was manipulated with respect to fundamental frequency (F0) and formant frequencies. Twelve implanted adults were included in the study.

ResultsGroup results revealed only a relatively small benefit of CI + HA compared with the CI alone. A detailed analysis of errors, which was assumed to be an indicator for the release from masking, revealed that this benefit was not attributed to improved target–masker segregation. The variable determined to be responsible for segregating target and masker talkers was a large difference in F0 of the voices. This held true for all CI alone, HA alone, and CI + HA listening conditions.

ConclusionsBimodal hearing improved overall speech recognition of both the target and the masker. No evidence for better target–masker separation with bimodal fitting could be found.

Acknowledgments
This research was supported by Cochlear Deutschland GmbH & Co. KG. (See Pyschny, Landwehr, Walger, von Wedel, and Meister [2008]  for the presentation of this project at the German Society of Audiology conference [June 2008]). We thank the cochlear implant subjects for their time and dedication. We also thank H. Cullington for providing valuable comments. Finally, we thank Guy Lightfoot and Josephine Wyss for proofreading the article.
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