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Frequency-to-electrode allocation and speech perception with cochlear implants.

Colette M McKay1, Katherine R Henshall

  • 1The University of Melbourne, Department of Otolaryngology, Parkville, Australia. colette@unimelb.edu.au

The Journal of the Acoustical Society of America
|February 28, 2002
PubMed
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Altering frequency allocation in cochlear implants (CI) did not consistently improve speech perception. While some low-frequency emphasis maps matched full electrode performance for vowels and noise, consonant perception suffered, indicating complex trade-offs in CI sound processing.

Area of Science:

  • Audiology
  • Biomedical Engineering
  • Neuroscience

Background:

  • Cochlear implants (CI) aim to restore hearing by stimulating the auditory nerve with electrical signals.
  • Optimizing the frequency-to-electrode allocation (pitch coding) is crucial for improving speech perception in CI users.
  • Previous research suggests that low-frequency information is vital for speech intelligibility.

Purpose of the Study:

  • To investigate whether enhancing low-frequency information discrimination improves speech perception in cochlear implant users.
  • To compare different frequency-to-electrode allocation strategies using limited (10-electrode) and full electrode configurations.

Main Methods:

  • Seven Nucleus CI22 users participated in a 2-week trial for each mapping condition.
  • Experimental conditions included 10-electrode maps with even or low-frequency-biased allocation, and full-electrode maps (usual and experimental filters).

Related Experiment Videos

  • Speech perception was assessed using words in quiet and sentences in noise.

    • Main Results:

    • Ten-electrode maps generally performed worse than full-electrode maps.
    • A 10-electrode map prioritizing low frequencies (9/10 electrodes) matched full-electrode performance for vowels and noise but was inferior for consonants.
    • An evenly allocated 10-electrode map matched full-electrode performance for consonants but was worse for vowels and noise.
    • CI users adapted to frequency shifts up to a ratio of 1.3 within 2 weeks.

    Conclusions:

    • Selective enhancement of low-frequency information via frequency-to-electrode allocation does not uniformly improve speech perception in cochlear implant users.
    • Performance trade-offs exist between vowel and consonant perception depending on the allocation strategy.
    • Further research is needed to optimize frequency-to-electrode mapping with a full complement of electrodes in Nucleus implants.