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Related Concept Videos

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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 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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Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
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The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the...
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Anticipating real-ear insertion response using an external auditory canal model.

Hidenobu Taiji1, Yasuhide Okamoto2, Jin Kanzaki2

  • 1Tsukushino ENT Clinic, 1-2-32 Ogawa, Machida, Tokyo 194-0003, Japan; Department of Otorhinolaryngology, Saiseikai Central Hospital, 1-4-17 Mita, Minato-ku, Tokyo, 108-0073, Japan.

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|November 10, 2021
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Summary

This study validates an external auditory canal (EAC) model for predicting real-ear aided response (REAR). Accurate acoustic correction prevents insufficient hearing aid amplification in the mid-frequency range.

Keywords:
Ear canal modelHearing aidReal ear measurementStanding waveWideband tympanometry

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Area of Science:

  • Audiology
  • Acoustics
  • Bioengineering

Background:

  • The external auditory canal (EAC) significantly influences hearing aid performance.
  • Accurate prediction of the real-ear aided response (REAR) is crucial for effective hearing aid fitting.
  • Existing models often do not fully account for the acoustic complexities within the EAC, such as standing waves.

Purpose of the Study:

  • To determine the acoustic characteristics of the EAC.
  • To develop and validate an EAC model incorporating the standing wave effect.
  • To predict the REAR using the developed EAC model.

Main Methods:

  • Derived EAC transfer function equations based on wave summation.
  • Investigated real-ear unaided gain (REUG) to validate the EAC model.
  • Measured hearing aid (HA) frequency response (65dB-FR) and REAR using wideband tympanometry (WBT) in seven patients (eight ears).

Main Results:

  • The EAC model incorporating standing waves was validated by REUG measurements.
  • Significant correlations were observed between measured and calculated REARs at key mid-frequencies (900 Hz, 1000 Hz, 2000 Hz, 3000 Hz).
  • Differences in HA performance and REARs were resolved after correcting for the EAC's acoustic characteristics.

Conclusions:

  • In-situ REAR can be accurately determined from hearing aid characteristics in the mid-frequency range by measuring WBT and applying the EAC model.
  • Failure to perform real-ear measurements poses a risk of inadequate hearing aid amplification, particularly in the mid-frequencies.