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Articles linked to this work by shared authors, journal, and citation graph.

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Erratum: Mathematical modeling of vowel perception by users of analog multichannel cochlear implants: Temporal and channel-amplitude cues. [J. Acoust. Soc. Am. 107(3), 1521-1529 (2000)].

The Journal of the Acoustical Society of America·2026
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A level adjusted cochlear frequency-to-place map for estimating tonotopic frequency mismatch with a cochlear implant.

bioRxiv : the preprint server for biology·2024

Related Experiment Video

Updated: May 28, 2025

Enhancing Electrode Location Assessment in Cochlear Implantation via Computed Tomography Image Fusion
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A Level-Adjusted Cochlear Frequency-to-Place Map for Estimating Tonotopic Frequency Mismatch With a Cochlear Implant.

Elad Sagi1, Mario A Svirsky

  • 1Department of Otolaryngology - Head & Neck Surgery, New York University Grossman School of Medicine, New York, New York, USA.

Ear and Hearing
|February 11, 2025
PubMed
Summary

A new level-adjusted correction refines the relationship between cochlear place and frequency, potentially improving cochlear implant (CI) programming and speech understanding for users.

Keywords:
Anatomical frequency mismatchCochlear implantsCochlear place-frequencyLevel correction

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Area of Science:

  • Auditory Neuroscience
  • Bioacoustics
  • Otolaryngology

Background:

  • The standard tonotopic map relates cochlear place to characteristic frequency (CF).
  • This map is crucial for programming cochlear implants (CIs).
  • Existing models may not fully account for frequency shifts at different sound levels.

Purpose of the Study:

  • To develop a level-adjusted correction for the human cochlear place-frequency map.
  • To re-evaluate frequency mismatch in CI recipients using this new correction.
  • To propose a more relevant tonotopic benchmark for CI programming.

Main Methods:

  • Compiled data from 15 animal studies on isointensity responses.
  • Extracted characteristic frequencies (CFs) and best frequencies (BFs) at 70 dB SPL.
  • Applied nonlinear regression to estimate human BFs and adjust the place-frequency function.

Main Results:

  • Best frequency (BF70) shifts significantly from CF, varying by cochlear location.
  • BF70 shifts downward by ~4 semitones up to 600° from the base, and upward by ~6 semitones beyond.
  • The revised map reduces perceived frequency mismatch in CI users, especially for apical electrodes.

Conclusions:

  • Validated the current standard for CF mapping while introducing a level-adjusted BF correction.
  • This correction offers a more accurate tonotopic reference for CIs.
  • Implementation may enhance CI outcomes, including speech understanding and perceptual accommodation.