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Related Concept Videos

Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
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Updated: Sep 2, 2025

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
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Published on: March 24, 2023

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Stimulation Rate and Voice Pitch Perception in Cochlear Implants.

Damir Kovačić1, Chris J James2

  • 1Department of Physics, Faculty of Science, University of Split, Ruđera Boškovića 33, 21000, Split, Croatia. Damir.Kovacic@pmfst.hr.

Journal of the Association for Research in Otolaryngology : JARO
|August 2, 2022
PubMed
Summary
This summary is machine-generated.

Reduced carrier rates in cochlear implants (CI) do not significantly impact pitch perception. Even at 250 pulses per second (pps), CI users can perceive voice pitch when using advanced sound coding strategies like Spectral and Temporal Enhanced Processing (STEP).

Keywords:
cochlear implantsloudnesssound coding strategystimulation ratevoice gender categorizationvoice pitch

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Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Cochlear implant (CI) stimulation rate affects pitch, loudness, and sound quality.
  • Understanding the impact of reduced carrier rates is crucial for optimizing CI sound coding strategies.

Purpose of the Study:

  • To investigate the effects of reduced carrier rates on loudness and pitch perception in CI users.
  • To evaluate a novel sound coder, Spectral and Temporal Enhanced Processing (STEP), for its ability to support pitch perception at low rates.

Main Methods:

  • Two experiments were conducted with 16 Nucleus® CI users using the STEP sound coder.
  • Experiment 1: Equivalence testing between STEP and the Advanced Combination Encoder (ACE) for pitch and gender perception.
  • Experiment 2: Loudness perception assessment and evaluation of carrier rate effects on pitch perception at 1000, 500, and 250 pps.

Main Results:

  • Most CI users could categorize voice gender above chance.
  • Pitch ranking varied among subjects, but overall, carrier rate had minimal impact.
  • Functional voice pitch perception was supported at rates as low as 250 pps when temporal modulations and pulse timings were controlled by STEP.

Conclusions:

  • Reduced carrier rates (down to 250 pps) can support functional voice pitch perception in CI users.
  • Novel sound coding strategies like STEP are effective in maintaining pitch perception at lower stimulation rates.
  • Optimized temporal processing in CI sound coders is key for preserving pitch cues at reduced carrier rates.