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Electrical stimulation rate effects on speech perception in cochlear implants.

Komal Arora1, Pam Dawson, Richard Dowell

  • 1Department of Otolaryngology, The University of Melbourne, Australia. karora@bionicear.org

International Journal of Audiology
|October 22, 2009
PubMed
Summary
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Higher stimulation rates (500-900 pulses-per-second/channel) significantly improve cochlear implant users' speech perception in noise. While quiet performance was unaffected, these findings suggest optimized electrical stimulation can enhance auditory function for cochlear implant recipients.

Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Cochlear implants (CIs) are vital for restoring hearing in deaf individuals.
  • Optimizing speech perception in noisy environments remains a challenge for CI users.
  • Electrical stimulation parameters, like pulse rate, influence CI performance.

Purpose of the Study:

  • To investigate the effect of low to moderate electrical stimulation rates on speech perception in quiet and noise.
  • To evaluate performance across four stimulation rates: 275, 350, 500, and 900 pulses-per-second/channel (pps/ch).
  • To assess subjective user preference for different stimulation rates.

Main Methods:

  • Eight postlingually deaf adult CI users participated.
  • Monosyllabic word recognition in quiet and sentence perception in noise were tested.

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  • A repeated ABCD design was used with loudness-balanced programs and take-home practice.
  • A questionnaire assessed subjective rate preference.

    • Main Results:

    • No significant difference in speech perception in quiet across stimulation rates for most subjects.
    • Significant improvements in speech perception in noise observed at 500 and 900 pps/ch for seven of eight subjects.
    • Subjective preference did not always align with optimal performance, but 500 pps/ch was often preferred in noise.

    Conclusions:

    • Higher stimulation rates (500 and 900 pps/ch) enhance speech perception in noise for Nucleus CI24 users.
    • Stimulation rate has a limited impact on speech perception in quiet.
    • Individual preferences may not directly correlate with objective performance, highlighting the need for personalized programming.