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Related Concept Videos

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 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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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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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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In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
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Effects of feedback01:24

Effects of feedback

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Feedback in control systems plays a critical role in shaping various operational parameters, extending beyond simple error reduction to influence stability, bandwidth, gain, impedance, and sensitivity. Understanding these effects requires examining a basic feedback system characterized by defined input, output, error, and feedback signals.
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Nonlinear cochlear mechanics without direct vibration-amplification feedback.

Alessandro Altoè1, Christopher A Shera1

  • 1Auditory Research Center, Caruso Department of Otolaryngology, University of Southern California, Los Angeles, California 90033, USA.

Physical Review Research
|January 6, 2021
PubMed
Summary
This summary is machine-generated.

A new cochlear model explains how the organ of Corti amplifies sound across a wide frequency range, differing from the traditional basilar membrane (BM) feedback model. This indirect feedback mechanism accounts for observed intensity invariance in BM responses.

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Area of Science:

  • Auditory neuroscience
  • Cochlear mechanics
  • Bioacoustics

Background:

  • Current cochlear models often assume direct feedback between basilar membrane (BM) motion and active amplification.
  • Recent experimental data show nonlinear amplification in the organ of Corti over a broader frequency range than in the BM itself.

Purpose of the Study:

  • To propose and validate a new phenomenological model of cochlear mechanics.
  • To explain discrepancies between experimental data and traditional cochlear models.
  • To investigate the mechanism of cochlear amplification and its relation to BM vibration.

Main Methods:

  • Development of a phenomenological cochlear model inspired by Zweig (2015).
  • Simulation of the model using data from mouse and gerbil cochlear recordings.
  • Analysis of active force regulation and its indirect coupling to BM motion.

Main Results:

  • The proposed model successfully accounts for recent experimental findings in mammalian cochleas.
  • Active forces are regulated indirectly via pressure fields, not direct BM feedback.
  • The model explains the intensity invariance of fine temporal structures in BM responses to acoustic stimuli.

Conclusions:

  • The textbook view of cochlear mechanics requires revision.
  • Indirect regulation of active forces provides a more accurate explanation for cochlear amplification.
  • This model offers insights into the functional mechanics of the auditory system.