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Related Experiment Videos

Cochlear implant speech processor frequency allocations may influence pitch perception.

Lina A J Reiss1, Bruce J Gantz, Christopher W Turner

  • 1Department of Speech Pathology and Audiology, The University of Iowa, Iowa City, Iowa 52242, U.S.A. lina-reiss@uiowa.edu

Otology & Neurotology : Official Publication of the American Otological Society, American Neurotology Society [And] European Academy of Otology and Neurotology
|November 21, 2007
PubMed
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Cochlear implant users adapted to shifted frequencies, suggesting pitch perception relies more on the device map than cochlear location. This supports shallower insertions and better hearing preservation.

Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Cochlear implants (CIs) aim to restore hearing by electrically stimulating the cochlea.
  • The Hybrid implant uses a shorter electrode, leading to shallower insertion depths.
  • Understanding pitch perception with shifted frequency allocations is crucial for optimizing CI performance.

Purpose of the Study:

  • To investigate the impact of assigning apical frequencies to shallow electrode insertion depths in the Iowa/Nucleus Hybrid cochlear implant.
  • To assess speech recognition and pitch perception in subjects using the Hybrid implant.

Main Methods:

  • Speech recognition was tested using Consonant-Nucleus-Consonant words and consonant stimuli.
  • Electrical pitch sensations from individual electrodes were measured.

Related Experiment Videos

  • Acoustic pitch sensations were measured in the contralateral ear.

    • Main Results:

    • Significant speech recognition improvements were observed within 12 months post-implantation.
    • Long-term use (24+ months) showed consonant discrimination comparable to deeper electrode insertions.
    • Pitch perceptions aligned more with the assigned implant map than predicted cochlear location.

    Conclusions:

    • Pitch sensation in cochlear implant users may be more influenced by the device's frequency map than the electrode's physical location over time.
    • The brain demonstrates adaptability by remapping pitch to spectral mismatches.
    • Shifted frequency allocations are viable for speech recognition, supporting shallower CI insertions and residual hearing preservation.