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Related Concept Videos

The Cochlea01:13

The Cochlea

45.1K
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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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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Related Experiment Video

Updated: Jul 9, 2025

Optogenetic Stimulation of the Auditory Nerve
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Intracochlear overdrive: Characterizing nonlinear wave amplification in the mouse apex.

Alessandro Altoè1, Karolina K Charaziak1

  • 1Caruso Department of Otolaryngology, University of Southern California, Los Angeles, California 90007, USA.

The Journal of the Acoustical Society of America
|November 28, 2023
PubMed
Summary
This summary is machine-generated.

This study reveals how nonlinear cochlear amplification modifies sound waves in the ear. A simple model explains this process, supporting the "overturned" theory of hearing.

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Area of Science:

  • Auditory Neuroscience
  • Bioacoustics
  • Nonlinear Dynamics

Background:

  • Cochlear amplification is crucial for hearing sensitivity and frequency selectivity.
  • The nonlinear nature of cochlear amplification remains a key area of investigation.

Purpose of the Study:

  • To analyze nonlinear cochlear amplification by examining basilar membrane (BM) motion in the mouse apex.
  • To develop and validate a mathematical model for the cochlear amplifier's nonlinear behavior.

Main Methods:

  • In vivo, postmortem, and mechanical suppression recordings of basilar membrane (BM) motion.
  • Estimation of the cochlear amplifier's effect on the wavenumber of BM traveling waves.
  • Incorporation of an empirically derived model into a physics-based "overturned" framework.

Main Results:

  • A simple model of the cochlear amplifier as a wavenumber modifier accurately explains experimental observations.
  • The model's validity extends beyond the short-wave approximation to broader frequency ranges.
  • The model successfully predicts the behavior of the cochlear partition's opposing side.

Conclusions:

  • The proposed mathematical model provides a parsimonious explanation for nonlinear cochlear amplification.
  • The findings strongly support the "overturned" theory of cochlear amplification.
  • The model's predictive power validates its applicability across wider frequency ranges.