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Related Concept Videos

The Cochlea01:13

The Cochlea

The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...

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Related Experiment Video

Updated: May 26, 2026

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
06:04

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

Published on: March 24, 2023

Temporal modulation transfer functions in cochlear implantees using a method that limits overall loudness cues.

Matthew Fraser1, Colette M McKay

  • 1School of Psychological Sciences, The University of Manchester, Manchester M13 9PL, UK.

Hearing Research
|December 8, 2011
PubMed
Summary

Cochlear implant users

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Last Updated: May 26, 2026

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
06:04

Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages

Published on: March 24, 2023

Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process
07:00

Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process

Published on: June 21, 2024

Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Cochlear implants (CIs) aim to restore hearing by electrically stimulating the auditory nerve.
  • Understanding temporal processing in CI users is crucial for improving speech perception.
  • Previous studies on modulation detection often overlooked loudness cues, potentially confounding results.

Purpose of the Study:

  • To measure temporal modulation transfer functions (TMTFs) in cochlear implant users.
  • To investigate the effects of carrier rate and level on modulation detection.
  • To assess temporal resolution while controlling for loudness perception.

Main Methods:

  • Temporal modulation transfer functions (TMTFs) were measured in six CI users.
  • Stimuli were loudness-balanced to control for perceived loudness cues.
  • Psychometric functions were used to determine modulation detection thresholds.

Main Results:

  • Controlled loudness cues confirmed that modulated stimuli are perceived as louder.
  • Measured TMTFs exhibited a low-pass characteristic, similar to normal-hearing listeners at comfortable levels.
  • Reduced levels and increased carrier rates generally degraded modulation detection efficiency and temporal resolution.

Conclusions:

  • Cochlear implant users' temporal processing, when loudness is controlled, resembles normal hearing.
  • Reduced loudness levels significantly impair temporal resolution in CI users.
  • Carrier rate impacts modulation detection, particularly at lower levels or higher modulation frequencies.