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Related Experiment Videos

Clinical evaluation of expanded input dynamic range in Nucleus cochlear implants.

P W Dawson1, A E Vandali, M R Knight

  • 1Cooperative Research Centre for Cochlear Implant and Hearing Aid Innovation, Melbourne, Victoria, Australia. pdawson@cochlear.com.au

Ear and Hearing
|May 15, 2007
PubMed
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Expanded instantaneous input dynamic ranges (IIDRs) in cochlear implants improve low-level speech perception. Wider IIDRs (46/56 dB) benefit hearing without hindering speech in noise, showing promise for real-world listening.

Area of Science:

  • Audiology
  • Biomedical Engineering
  • Hearing Science

Background:

  • Cochlear implants enhance hearing for individuals with severe to profound hearing loss.
  • Traditionally, Nucleus cochlear implants utilized a limited instantaneous input dynamic range (IIDR) of approximately 30 dB.
  • Expanding the IIDR may improve audibility and speech perception in complex listening environments.

Purpose of the Study:

  • To evaluate the impact of expanded instantaneous input dynamic ranges (IIDRs) on speech perception in Nucleus cochlear implant users.
  • To compare the effectiveness of 31 dB, 46 dB, and 56 dB IIDRs in both laboratory and real-world listening conditions.
  • To assess user acceptance and tolerance of wider IIDR settings.

Main Methods:

  • A within-subjects study involving nine adult cochlear implant recipients.

Related Experiment Videos

  • Participants experienced three IIDR settings (31 dB, 46 dB, 56 dB) for two-week periods.
  • Speech perception was tested using CNC words in quiet and CUNY sentences in multi-talker babble.

    • Main Results:

    • Word recognition in quiet at lower levels significantly improved with 46 dB and 56 dB IIDRs compared to 31 dB.
    • Benefits were more pronounced with standard programs than with reduced threshold programs.
    • No significant differences in sentence perception in babble were observed across the IIDR conditions.

    Conclusions:

    • Expanded IIDRs of 46 dB and 56 dB enhance access to low-level speech sounds without compromising speech understanding in noise.
    • The majority of participants tolerated the wider IIDR programs in daily life.
    • No significant performance differences were found between the 46 dB and 56 dB IIDR settings.