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Related Concept Videos

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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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Related Experiment Video

Updated: Dec 10, 2025

Investigating Outer Hair Cell Motility with a Combination of External Alternating Electrical Field Stimulation and High-speed Image Analysis
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The cochlear outer hair cell speed paradox.

Richard D Rabbitt1

  • 1Biomedical Engineering, Otolaryngology, and Neuroscience Program, University of Utah, Salt Lake City, UT 84112 r.rabbitt@utah.edu.

Proceedings of the National Academy of Sciences of the United States of America
|August 28, 2020
PubMed
Summary

Outer hair cells (OHCs) drive high-frequency hearing by overcoming cochlear load, not by intrinsic motor speed. This resolves the OHC speed paradox, revealing ultrafast function through nonlinear capacitance.

Keywords:
capacitanceelectromotilitypiezoelectricityprestintemperature

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Area of Science:

  • Auditory Neuroscience
  • Cellular Biophysics
  • Mammalian Hearing

Background:

  • Outer hair cells (OHCs) are crucial for high-frequency hearing in mammals.
  • OHCs are hypothesized to amplify cochlear vibrations via length changes.
  • Recent data suggest OHCs are low-pass filtered, creating the 'OHC speed paradox'.

Purpose of the Study:

  • Resolve the OHC speed paradox.
  • Investigate the origins of ultrafast OHC function and power output.
  • Examine OHC function within the context of cochlear load.

Main Methods:

  • Analysis of OHC electromotility speed in relation to cochlear load.
  • Investigation of OHC power output at auditory frequencies.
  • Modeling of electrical charge displacement and its effect on motor function.

Main Results:

  • OHC electromotility speed is determined by the cell's ability to extend against load, not intrinsic motor speed.
  • Ultrafast OHC function is achieved through mechanisms independent of the motor element's intrinsic speed.
  • An imaginary nonlinear capacitance reveals OHC power output, reflecting charge displacement needed to overcome viscous cochlear load.

Conclusions:

  • The OHC speed paradox is resolved by considering the cochlear load.
  • Ultrafast OHC function and power output originate from their interaction with the cochlear environment.
  • Nonlinear capacitance is key to understanding OHCs' role in high-frequency hearing.