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Related Concept Videos

The Cochlea01:13

The Cochlea

46.2K
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 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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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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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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Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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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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Anatomy of the Ear01:16

Anatomy of the Ear

9.0K
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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Related Experiment Video

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In Vitro Wedge Slice Preparation for Mimicking In Vivo Neuronal Circuit Connectivity
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Signatures of cochlear processing in neuronal coding of auditory information.

Nadège Marin1, Fernando Lobo Cerna1, Jérémie Barral2

  • 1Institut de l'Audition, Institut Pasteur, INSERM, Paris, France.

Molecular and Cellular Neurosciences
|April 30, 2022
PubMed
Summary

The mammalian cochlea amplifies faint sounds using somatic and hair-bundle motility. Tonotopy, a key organizational principle, enables precise frequency discrimination by mapping sound frequencies to specific cochlear locations.

Keywords:
Cochlear physiologyFrequency selectivityTemporal codingTonotopy

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Postsynaptic Recordings at Afferent Dendrites Contacting Cochlear Inner Hair Cells: Monitoring Multivesicular Release at a Ribbon Synapse
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Area of Science:

  • Auditory Neuroscience
  • Bioacoustics
  • Mammalian Physiology

Background:

  • The vertebrate ear detects faint sounds via amplification mechanisms.
  • Mammalian hearing exhibits high amplitude sensitivity and frequency discrimination.
  • Two proposed mechanisms for sound amplification in the cochlea are somatic electromotility and active hair-bundle motility.

Purpose of the Study:

  • To review cochlear mechanisms for sound encoding, focusing on frequency decomposition.
  • To explain how tonotopy arises from biophysical gradients in the sensory epithelium.
  • To describe how cochlear structure shapes the neural code for brain processing.

Main Methods:

  • Review of existing literature on cochlear mechanics and auditory processing.
  • Analysis of the biophysical properties underlying tonotopic mapping.
  • Examination of neural coding strategies, including phase-locked responses and ribbon synapses.

Main Results:

  • Sound amplification in the cochlea involves both somatic and hair-bundle motility.
  • Tonotopic mapping, a fundamental principle, allows for spectral decomposition of complex sounds.
  • Ribbon synapses and spiral ganglion neurons are tuned for processing periodic stimuli based on frequency.

Conclusions:

  • Cochlear structure and function, particularly tonotopy and neural coding, are crucial for accurate sound frequency perception.
  • The phase-locked response of auditory nerve fibers and tonotopy are essential for decoding sound frequency.
  • These mechanisms enable the auditory system to process complex sounds and transmit meaningful information to the brain.