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Related Experiment Video

Updated: Jan 26, 2026

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Dynamic current focusing for loudness encoding in cochlear implants: a take-home trial.

Monique A M de Jong1, Jeroen J Briaire1, Séline F S van der Woude1

  • 1a Department of Otorhinolaryngology and Head and Neck Surgery , Leiden University Medical Center , Leiden , the Netherlands.

International Journal of Audiology
|April 24, 2019
PubMed
Summary

The dynamic current focusing (DCF) cochlear implant (CI) strategy shows potential for improved hearing in noise, but learning effects complicate results. Battery life with DCF was 9 hours, compared to 13.4 hours with the standard strategy.

Keywords:
Cochlear implantscurrent focussingdynamic current focussingloudness codingspectral resolutionspeech intelligibility

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Area of Science:

  • Audiology
  • Biomedical Engineering
  • Neuroscience

Background:

  • Dynamic Current Focusing (DCF) is an energy-efficient speech-processing strategy for cochlear implants (CIs).
  • Previous studies indicated potential benefits of DCF at low loudness levels, but with reduced battery life.
  • Long-term adaptation and performance with DCF require further investigation.

Purpose of the Study:

  • To evaluate the long-term efficacy and user adaptation to an energy-efficient dynamic current focusing (DCF) speech-processing strategy in cochlear implant (CI) users.
  • To compare the DCF strategy with the standard clinical strategy regarding speech intelligibility, spectral and temporal processing, and battery life.

Main Methods:

  • A within-subject design compared the clinical strategy with the DCF strategy in 20 CI users over 5 weeks of at-home use.
  • Assessments included speech intelligibility in noise, spectral ripple discrimination, temporal modulation detection, loudness growth, and subjective ratings.
  • Battery life was a key performance metric evaluated for both strategies.

Main Results:

  • Average battery life with DCF was 9 hours, versus 13.4 hours with the clinical strategy.
  • While initial improvements in spectral-temporally modulated ripple test (SMRT) scores and speech intelligibility in noise were observed with DCF, these benefits diminished over time due to learning effects.
  • Speech intelligibility in noise significantly declined relative to the final control measurement with the clinical strategy.

Conclusions:

  • Most cochlear implant users can adapt to the DCF strategy in a real-world setting.
  • The DCF strategy shows potential for enhancing performance on tests like the SMRT, but learning effects complicate the interpretation of long-term outcomes.
  • Further research is needed to mitigate learning effects and optimize DCF strategy implementation for sustained benefits.