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Related Experiment Videos

Pulse rate discrimination with deeply inserted electrode arrays.

Uwe Baumann1, Andrea Nobbe

  • 1Department of Otorhinolaryngology, ENT - Audiology, University of Munich, Marchioninistr. 15, 81377 München, Germany. uwe.baumann@med.uni-muenchen.de

Hearing Research
|October 7, 2004
PubMed
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The ability to distinguish changes in pulse rate (PRDL) and amplitude modulation (AMDL) is limited in cochlear implant users. Even with deep electrode insertion, discrimination performance does not significantly improve with lower pulse rates.

Area of Science:

  • Auditory Neuroscience
  • Cochlear Implant Technology
  • Psychoacoustics

Background:

  • Cochlear implants aim to restore hearing by electrically stimulating the auditory nerve.
  • Optimizing speech perception in cochlear implant users involves understanding the limits of electrical hearing.
  • The MED-EL COMBI 40+ implant allows deep electrode insertion to potentially reduce rate/place mismatch.

Purpose of the Study:

  • To assess the pulse rate difference limen (PRDL) and amplitude modulation difference limen (AMDL) in MED-EL COMBI 40+ users.
  • To investigate the effect of base pulse rate and electrode location on these discrimination abilities.
  • To determine the upper limit of base pulse rate for effective rate discrimination.

Main Methods:

  • Seven subjects with MED-EL COMBI 40+ implants participated.

Related Experiment Videos

  • A three-interval, two-alternative forced-choice procedure with feedback was used.
  • PRDL and AMDL were measured across various base pulse rates (200-800 pps) and electrode locations.

    • Main Results:

    • PRDL increased significantly with increasing base pulse rate.
    • AMDL was consistently higher than PRDL across all tested base rates.
    • No significant difference in PRDL was found between apical and basal electrode locations.
    • Auditory perception of rate changes was limited to base rates up to approximately 283 pps.

    Conclusions:

    • Rate discrimination in electrical hearing is limited, with changes smaller than a major third being indistinguishable.
    • Deep electrode insertion and reduced rate/place mismatch did not improve discrimination performance.
    • The findings suggest fundamental limitations in the neural processing of temporal fine structure in electrical hearing.