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The cochlear implant electrode-pitch function.

Uwe Baumann1, Andrea Nobbe

  • 1Department of Otorhinolaryngology, University of Munich, Marchioninistr. 15, 81377 München, Germany. Uwe.Baumann@med.uni-muenchen.de

Hearing Research
|January 31, 2006
PubMed
Summary
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The cochlear frequency-place function for electrical stimulation via cochlear implants is linear, not exponential like in normal hearing. This study investigated pitch perception in MED-EL COMBI 40+ users.

Area of Science:

  • Auditory Neuroscience
  • Biomedical Engineering
  • Otolaryngology

Background:

  • The cochlear frequency-place function describes how different sound frequencies map to specific locations in the cochlea.
  • This function is typically exponential in normal hearing ears across various species.
  • It is unknown if this exponential relationship holds for electrical stimulation using cochlear implants.

Purpose of the Study:

  • To investigate the frequency-place function for electrical stimulation in cochlear implant (CI) users.
  • To compare the pitch perception elicited by electrical stimulation with the known acoustic frequency-place function.

Main Methods:

  • A binaural pitch adjustment experiment was conducted with six MED-EL COMBI 40+ CI users.
  • Participants adjusted the frequency of a pure tone in their non-implanted ear to match the pitch perceived from electrical stimulation in the implanted ear.

Related Experiment Videos

  • Electrode position and insertion depth were controlled and estimated.

    • Main Results:

    • Pitch perception generally corresponded linearly to electrode position along the cochlea.
    • An average increase of 98 Hz per electrode separation (40 Hz/mm) was observed.
    • The two most apical electrodes deviated from this linear trend for most subjects.

    Conclusions:

    • The frequency-place function for electrical stimulation with the COMBI 40+ cochlear implant is predominantly linear.
    • This linear relationship contrasts with the established exponential function for acoustic hearing.
    • Findings suggest a different tonotopic mapping for electrical stimulation compared to acoustic stimulation.