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Related Concept Videos

Sound Waves: Interference00:53

Sound Waves: Interference

Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
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The Cochlea01:13

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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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Performing Repeated Intraoperative Impedance Telemetry Measurements during Cochlear Implantation
06:54

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Published on: August 4, 2023

Binaural interference in bilateral cochlear-implant listeners.

Virginia Best1, Bernhard Laback, Piotr Majdak

  • 1School of Medical Sciences, University of Sydney, Sydney, NSW 2006, Australia. ginbest@bu.edu

The Journal of the Acoustical Society of America
|November 18, 2011
PubMed
Summary

Binaural interference, a challenge in electric hearing, was investigated. Results suggest this interference is partly central, influenced by grouping mechanisms in cochlear implant users.

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Area of Science:

  • Auditory Neuroscience
  • Cochlear Implant Technology
  • Signal Processing in Hearing

Background:

  • Binaural interference impacts sound localization in hearing.
  • Understanding its occurrence in electric hearing is crucial for cochlear implant (CI) efficacy.
  • Distinguishing between peripheral and central origins of interference is key.

Purpose of the Study:

  • To determine if binaural interference occurs in electric hearing.
  • To investigate if the interference stems from central perceptual grouping or peripheral cochlear spread.
  • To assess the role of grouping mechanisms in CI sound processing.

Main Methods:

  • Six bilateral CI users participated in experiments.
  • Judgments of target pulse train lateralization were made under interference.
  • Interaural time differences (ITDs) and interaural level differences (ILDs) were used for lateralization.
  • Stimuli were presented to widely separated electrodes (apical and basal).

Main Results:

  • Significant binaural interference was observed in most participants.
  • Results mirrored findings from acoustic hearing studies.
  • Interference showed robust recovery when the interferer was part of a grouped stream of pulse trains.

Conclusions:

  • Binaural interference occurs in electric hearing, similar to acoustic hearing.
  • Evidence suggests a significant central component, mediated by perceptual grouping.
  • Both simultaneous and sequential grouping mechanisms appear to operate in electric hearing with wide tonotopic separation.