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Related Experiment Videos

Clues to the cochlear amplifier from the turtle ear.

R Fettiplace1, A J Ricci, C M Hackney

  • 1Dept of Physiology, University of Wisconsin Medical School, Madison, WI 53706, USA. fettiplace@physiology.wisc.edu

Trends in Neurosciences
|February 22, 2001
PubMed
Summary

Sensory hair cells in the cochlea generate rapid, active movements via ion channels. These movements, triggered by calcium entry, are crucial for hearing by potentially amplifying sound and improving frequency discrimination.

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Area of Science:

  • Auditory Neuroscience
  • Mechanobiology
  • Cellular Physiology

Background:

  • Sound detection in the cochlea involves hair bundle vibrations on sensory hair cells.
  • Mechanotransducer ion channels convert mechanical stimuli into electrical signals.
  • Active movements generated by these ion channels can influence sound perception.

Purpose of the Study:

  • To investigate the speed and characteristics of active hair bundle movements.
  • To determine the role of calcium (Ca2+) in triggering these movements.
  • To assess the potential contribution of active movements to cochlear amplification and frequency discrimination.

Main Methods:

  • Measurements of active hair bundle movements in the turtle ear.
  • Analysis of the temporal dynamics and triggers of these movements.

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  • Investigation of the relationship between movement speed and cellular frequency sensitivity.

    • Main Results:

    • Active hair bundle movements were observed with delays under one millisecond.
    • Calcium (Ca2+) entry via mechanotransducer channels triggers these rapid movements.
    • The speed of active movements is frequency-dependent, correlating with the hair cell's best frequency.

    Conclusions:

    • Active hair bundle movements are exceptionally fast, occurring within milliseconds.
    • These movements, driven by calcium influx, are likely critical for enhancing sound energy.
    • The findings suggest a significant role for active movements in cochlear amplification and precise frequency discrimination.