Binaural redundancy and inter-aural time difference cues for patients wearing a cochlear implant and a hearing aid in opposite ears

Teresa Y. C. Ching*, Emma van Wanrooy, Mandy Hill, Harvey Dillon

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

We investigated speech perception advantages arising from the use of inter-aural time difference cues, and from the provision of redundant information by the use of a hearing aid contralateral to a cochlear implant (bimodal hearing devices). Thirty-eight subjects (14 normally hearing and 23 hearing-impaired) participated in this study. The effect of binaural redundancy was assessed by comparing the signal-to-noise ratio (SNR) required for 50% correct identification of sentences in noise when listening monaurally to that when listening binaurally. The use of inter-aural time difference cues was determined by comparing the binaural SNRs obtained with or without a noise delay of 700 µs between ears. Results indicated adults who used bimodal hearing devices benefited from binaural redundancy, but children did not. Whereas normally hearing subjects used inter-aural time difference cues to improve speech perception in noise, neither adults nor children who used bimodal hearing devices were able to do so.
Original languageEnglish
Pages (from-to)513-521
Number of pages9
JournalInternational Journal of Audiology
Volume44
Issue number9
DOIs
Publication statusPublished - 2005
Externally publishedYes

Keywords

  • cochlear implant and hearing aid
  • speech intelligibility
  • binaural redundancy
  • inter-aural time difference
  • binaural squelch

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