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Related Experiment Videos

Loudness perception with pulsatile electrical stimulation: the effect of interpulse intervals

C M McKay1, H J McDermott

  • 1University of Melbourne, Department of Otolaryngology, Parkville, Australia.

The Journal of the Acoustical Society of America
|August 26, 1998
PubMed
Summary

Cochlear implant loudness perception depends on interpulse intervals. A three-stage model accurately predicted loudness, estimating neural refractory times and suggesting loudness increases due to neuron recruitment, not firing probability.

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Short-term auditory memory in children using cochlear implants and its relevance to receptive language.

Journal of speech, language, and hearing research : JSLHR·2002

Area of Science:

  • Auditory Neuroscience
  • Cochlear Implant Technology
  • Psychoacoustics

Background:

  • Understanding loudness perception is crucial for effective cochlear implant (CI) device programming.
  • Interactions between stimulus timing and neural responses significantly influence auditory perception in CI users.

Purpose of the Study:

  • To investigate how interpulse intervals (IPIs) affect loudness perception in CI users.
  • To evaluate a three-stage model of loudness perception using CI psychophysical data.

Main Methods:

  • Eight adult CI users participated, tested at three stimulus levels across their dynamic range.
  • Equal-loudness contours and thresholds were measured for biphasic pulse trains with varying IPIs (4 ms, 20 ms) and repetition rates (20–750 Hz).
  • Stimuli had a 500-ms duration and pulse phase durations ≤100 µs.

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Main Results:

  • Experimental data aligned with predictions from a three-stage loudness model (refractory effect, integration window, decision device).
  • The model estimated neural refractory times averaging 7.3 ms and average neural spike probability of 0.77 at 50 Hz.
  • These neural parameters showed no systematic level dependence.

Conclusions:

  • The findings support a three-stage model for loudness perception in CI users.
  • Loudness growth with increasing current level is primarily attributed to neural recruitment rather than increased average spike probability.
  • The study provides insights into the neural refractory characteristics of the peripheral neural population in CI recipients.