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Related Concept Videos

Anatomy of the Ear01:16

Anatomy of the Ear

Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...
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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
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The Cochlea01:13

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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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A Comparative Study of Drug Delivery Methods Targeted to the Mouse Inner Ear: Bullostomy Versus Transtympanic Injection
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Inter-aural attenuation with insert earphones.

Kevin J Munro1, Alia Contractor

  • 1School of Psychological Sciences, University of Manchester, UK. kevin.munro@manchester.ac.uk

International Journal of Audiology
|August 26, 2010
PubMed
Summary
This summary is machine-generated.

This study measured inter-aural attenuation (IA) for insert earphones in adults with unilateral hearing loss. Foam earplugs offered higher IA (50-55 dB) than custom acrylic earmoulds (45-50 dB).

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Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss
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09:44

Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss

Published on: January 25, 2016

Area of Science:

  • Audiology
  • Hearing Science
  • Medical Devices

Background:

  • Unilateral hearing loss presents unique audiological challenges.
  • Accurate inter-aural attenuation (IA) measurements are crucial for effective hearing aid fitting and audiological testing.
  • Insert earphones are commonly used, but their attenuation characteristics can vary with different earpieces.

Purpose of the Study:

  • To determine inter-aural attenuation (IA) values for pure tones and broadband clicks using ER-3A insert earphones.
  • To compare IA values obtained with a standard foam earplug versus a customized hard acrylic earmould.
  • To assess the efficacy of different earpieces in preventing sound crossover in individuals with unilateral hearing loss.

Main Methods:

  • Fifteen adult participants with a history of unilateral dead ear were recruited.
  • Inter-aural attenuation (IA) was measured by calculating the difference between the non-masked air conduction thresholds of the better and poorer ears.
  • Measurements were conducted using ER-3A insert earphones fitted with either a foam earplug or a custom hard acrylic earmould, testing both pure tones and broadband clicks.

Main Results:

  • Minimum IA values for the foam earplug were 50 dB for pure tones and 55 dB for broadband clicks.
  • Minimum IA values for the hard acrylic earmould were 45 dB for pure tones and 50 dB for broadband clicks.
  • The foam earplug demonstrated consistently higher inter-aural attenuation compared to the custom earmould across both stimulus types.

Conclusions:

  • Foam earplugs provide superior inter-aural attenuation compared to custom hard acrylic earmoulds when using ER-3A insert earphones.
  • These findings have implications for audiological test procedures and hearing aid fitting in patients with unilateral hearing loss.
  • The choice of earpiece can significantly impact the accuracy of audiological assessments by affecting sound leakage and crossover.