The Contribution of Matched Envelope Dynamic Range to the Binaural Benefits in Simulated Bilateral Electric Hearing PurposeThis study examined the effects of envelope dynamic-range mismatch on the intelligibility of Mandarin speech in noise by simulated bilateral electric hearing.MethodNoise-vocoded Mandarin speech, corrupted by speech-shaped noise at 5 and 0 dB signal-to-noise ratios, was presented unilaterally or bilaterally to 10 normal-hearing listeners for recognition. For unilateral conditions, the ... Research Note
Research Note  |   August 01, 2013
The Contribution of Matched Envelope Dynamic Range to the Binaural Benefits in Simulated Bilateral Electric Hearing
 
Author Affiliations & Notes
  • Fei Chen
    Prince Philip Dental Hospital, The University of Hong Kong, SAR, People’s Republic of China
  • Lena L. N. Wong
    Prince Philip Dental Hospital, The University of Hong Kong, SAR, People’s Republic of China
  • Jianxin Qiu
    The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, People’s Republic of China
  • Yehai Liu
    The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, People’s Republic of China
  • Behnam Azimi
    University of Wisconsin–Milwaukee
  • Yi Hu
    University of Wisconsin–Milwaukee
  • Correspondence to Fei Chen: feichen1@hku.hk
  • Editor: Craig Champlin
    Editor: Craig Champlin×
  • Associate Editor: Marjorie Leek
    Associate Editor: Marjorie Leek×
Article Information
Hearing & Speech Perception / Acoustics / Special Populations / Cultural & Linguistic Diversity / Speech, Voice & Prosody / Hearing
Research Note   |   August 01, 2013
The Contribution of Matched Envelope Dynamic Range to the Binaural Benefits in Simulated Bilateral Electric Hearing
Journal of Speech, Language, and Hearing Research, August 2013, Vol. 56, 1166-1174. doi:10.1044/1092-4388(2012/12-0255)
History: Received August 14, 2012 , Revised October 5, 2012 , Accepted December 24, 2012
 
Journal of Speech, Language, and Hearing Research, August 2013, Vol. 56, 1166-1174. doi:10.1044/1092-4388(2012/12-0255)
History: Received August 14, 2012; Revised October 5, 2012; Accepted December 24, 2012
Web of Science® Times Cited: 3

PurposeThis study examined the effects of envelope dynamic-range mismatch on the intelligibility of Mandarin speech in noise by simulated bilateral electric hearing.

MethodNoise-vocoded Mandarin speech, corrupted by speech-shaped noise at 5 and 0 dB signal-to-noise ratios, was presented unilaterally or bilaterally to 10 normal-hearing listeners for recognition. For unilateral conditions, the right ear was presented with the 8-channel noise-vocoded stimuli generated using a 15-dB envelope dynamic range (DR). To simulate the envelope DR mismatch between the 2 ears, the left ear was presented with the 8-channel noise-vocoded stimuli generated using a 5-, 10-, or 15-dB envelope DR, respectively.

ResultsSignificant binaural summation benefits for Mandarin speech recognition were observed only with matched envelope DR between the 2 ears. With reduced DR, the performance of tone identification was more consistent in the steady-state speech-shaped noise than that of sentence recognition.

ConclusionsConsistent with previous findings, the present results suggest that Mandarin speech-perception performance of bilateral electric listening in noise is affected by the difference of envelope DR between the 2 implanted ears, and the binaural summation benefits are maximized when DR mismatch is minimized between the 2 implanted ears.

Acknowledgments
This research was supported, in part, by Faculty Research Fund, Faculty of Education, The University of Hong Kong; by Seed Funding for Basic Research, The University of Hong Kong; and by the General Research Fund (GRF), administered by the Hong Kong Research Grants Council.
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