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Related Concept Videos

Auditory Pathway01:15

Auditory Pathway

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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.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
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Hearing01:31

Hearing

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When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
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Anatomy of the Ear01:16

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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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The Cochlea01:13

The 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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Auditory Perception01:17

Auditory Perception

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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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Hair Cells01:22

Hair Cells

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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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Optogenetic Stimulation of the Auditory Nerve
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Speech Auditory Brainstem Response through hearing aid stimulation.

Ludovic Bellier1, Evelyne Veuillet2, Jean-François Vesson3

  • 1Lyon Neuroscience Research Center, Brain Dynamics and Cognition team, INSERM U1028, CNRS UMR5292, Lyon, F-69000, France; University Lyon 1, Lyon, F-69000, France.

Hearing Research
|April 2, 2015
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to record speech Auditory Brainstem Response (speech ABR) through hearing aids. This breakthrough enables artifact-free recordings, improving objective audiometry for hearing aid fitting.

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Area of Science:

  • Audiology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Millions globally experience hearing impairment, often using hearing aids.
  • Objective audiometry, particularly for non-communicative patients, can optimize hearing aid fitting.
  • Speech Auditory Brainstem Response (speech ABR) is a promising electrophysiological marker for objective audiometry.

Purpose of the Study:

  • To assess a novel approach for recording high-quality, artifact-free speech ABR via direct hearing aid stimulation.
  • To overcome challenges in recording aided-speech ABR due to high-frequency components and temporal precision demands.

Main Methods:

  • Speech ABRs were recorded in 4 normal-hearing adults using a /ba/ syllable stimulus.
  • Stimuli were delivered binaurally through insert earphones (control) and hearing aids.
  • Mute condition recordings were performed to identify and assess stimulus artifacts.

Main Results:

  • The new approach successfully yielded artifact-free speech ABR recordings in all participants via hearing aid stimulation.
  • Recording quality, assessed by signal-to-noise (SNR) measurements, was comparable to using insert earphones.
  • The method ensured the high temporal precision required for speech ABR.

Conclusions:

  • Directly transmitting speech stimuli through hearing aids is a viable method for recording high-quality speech ABR.
  • This technique represents a significant advancement for hearing impairment investigation and hearing aid fitting.
  • The approach addresses the need for precise electrophysiological measurements in aided listening conditions.