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A different approach to using neural response telemetry for automated cochlear implant processor programming.

Colette M McKay1, Leonie Fewster, Pam Dawson

  • 1The University of Melbourne, Department of Otolaryngology, Melbourne, Australia. c.m.mckay@aston.ac.uk

Ear and Hearing
|August 6, 2005
PubMed
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This study investigated the relationship between objective Neural Response Telemetry (NRT) and subjective psychophysical measures for cochlear implant fitting. Results indicate NRT alone is not a reliable predictor for behavioral levels, suggesting a need for additional objective measures.

Area of Science:

  • Audiology
  • Biomedical Engineering
  • Neuroscience

Background:

  • Cochlear implant (CI) fitting relies on correlating objective Neural Response Telemetry (NRT) thresholds with psychophysical measurements.
  • Variability in this relationship across implantees poses challenges for accurate CI programming.

Purpose of the Study:

  • To explore the theoretical relationship between psychophysically measured current levels and NRT thresholds.
  • To understand inter-implantee variability in this relationship.
  • To identify objective measures for improving NRT predictability for behavioral mapping levels.

Main Methods:

  • A loudness model was developed to explain rate-dependent loudness perception and NRT-psychophysical discrepancies.
  • The model suggested measuring the effect of interphase gap on NRT amplitude as a potential improvement.

Related Experiment Videos

  • This was experimentally tested in eight subjects (26 electrodes).

    • Main Results:

    • The hypothesis that interphase gap changes correlate with behavioral-NRT threshold offsets was not supported by the data.
    • Several potential reasons for this outcome were discussed.

    Conclusions:

    • The developed loudness model offers insights into the limitations of NRT as a sole predictor for CI mapping.
    • Additional objective measures, beyond current NRT protocols, are likely necessary to enhance predictability.
    • Further experimental investigation of these insights is recommended.