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Extending pulse phase durations during ECAP recordings to optimise perceived loudness.

Tobias Raffelsberger1, Kathrin Lauss2, Thomas Rasse1

  • 1Klinikum Wels-Grieskirchen, Wels, Austria.

International Journal of Audiology
|August 14, 2025
PubMed
Summary

Adjusting pulse phase duration (PD) in cochlear implant (CI) electrical compound action potential (ECAP) tests can improve user comfort. Longer PDs reduce loudness perception, benefiting sensitive CI users.

Keywords:
AutoARTCochlear implantECAPperceived loudnessphase duration

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Area of Science:

  • Audiology
  • Biomedical Engineering
  • Neuroscience

Background:

  • Cochlear implants (CI) use electrical compound action potentials (ECAPs) to assess neural response.
  • Loudness sensitivity can limit ECAP measurement efficacy.
  • Optimizing stimulation parameters like pulse phase duration (PD) may enhance user tolerance and data quality.

Purpose of the Study:

  • To investigate the impact of varying pulse phase durations (PDs) on ECAP thresholds, loudness perception, and measurement success rates in CI users.
  • To determine if adjusting PD can improve tolerance for ECAP measurements.

Main Methods:

  • ECAP measurements were performed using AutoART software with PDs ranging from 30 to 100 µs.
  • Loudness perception was evaluated alongside ECAP measurements.
  • Twenty MED-EL CI users participated in the study.

Main Results:

  • Longer PDs (80 & 100 µs) allowed higher maximum stimulation charges and were perceived as less loud.
  • Both ECAP and perceptual thresholds increased with longer PDs.
  • ECAP threshold determination rates remained consistent across tested PDs.

Conclusions:

  • Increasing pulse phase duration in ECAP measurements can decrease loudness discomfort for CI users.
  • This adjustment offers a potential benefit for sensitive CI users in clinical audiology settings.