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Related Concept Videos

The Cochlea01:13

The Cochlea

46.8K
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.
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Perceiving Loudness, Pitch, and Location01:21

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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.
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...
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Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery
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Modulation Depth Discrimination by Cochlear Implant Users.

Jessica J M Monaghan1,2, Robert P Carlyon3, John M Deeks3

  • 1Macquarie University, The Australian Hearing Hub, NSW, 2109, Sydney, Australia. jessica.monaghan@nal.gov.au.

Journal of the Association for Research in Otolaryngology : JARO
|January 26, 2022
PubMed
Summary
This summary is machine-generated.

Cochlear implant (CI) users may not effectively process the full speech amplitude envelope. Research indicates CI users are insensitive to significant portions of the envelope, impacting speech perception.

Keywords:
Amplitude modulation sensitivityCochlear implant (CI)EnvelopeMaskingModulation depth discriminationTemporal processingTemporal window

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Area of Science:

  • Auditory Neuroscience
  • Speech Processing
  • Hearing Technology

Background:

  • Cochlear implants (CIs) encode speech amplitude envelopes using pulse trains.
  • Perception of amplitude modulation (AM) in CI users may be limited by masking effects.
  • Understanding envelope processing is crucial for improving CI speech intelligibility.

Purpose of the Study:

  • To investigate the extent to which cochlear implant users can effectively process the amplitude envelope of speech.
  • To determine which portions of the amplitude envelope are critical for perception by CI users.
  • To explore the impact of AM frequency on envelope processing in CI users.

Main Methods:

  • Three experiments utilized modulated pulse trains to assess envelope perception in CI users.
  • Tasks included discrimination of modulation depth with and without loudness cues.
  • Novel stimuli were developed to manipulate envelope portions without altering loudness.

Main Results:

  • CI users demonstrated insensitivity to substantial portions of the amplitude envelope.
  • Insensitivity varied based on experimental conditions, ranging from 30% to 80% of the dynamic range.
  • Loudness cues influenced the degree of envelope portion processed.

Conclusions:

  • Significant portions of the speech envelope are not accurately encoded by current CI technology.
  • Findings suggest limitations in CI signal processing strategies impacting speech perception.
  • Further research is needed to optimize CI processing for enhanced envelope representation.