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Related Experiment Videos

Cooling induces a decrease in middle ear compliance

M Geal-Dor1, R Khvoles, H Sohmer

  • 1Speech and Hearing Center, Hadassah University Hospital, Jerusalem, Israel.

Journal of Basic and Clinical Physiology and Pharmacology
|January 1, 1997
PubMed
Summary

Cooling rats reversibly decreased middle ear compliance, indicating increased stiffness. This finding explains part of the reduction in otoacoustic emissions observed during cooling.

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Area of Science:

  • Otolaryngology
  • Auditory Physiology
  • Biophysics

Background:

  • The middle ear's conductive mechanism is crucial for hearing.
  • Otoacoustic emissions (OAEs) are sensitive to middle ear function.
  • Temperature effects on middle ear mechanics are not fully understood.

Purpose of the Study:

  • To investigate the impact of cooling and rewarming on the conductive mechanism of the rat middle ear.
  • To determine if changes in middle ear mechanics contribute to temperature-induced alterations in OAEs.

Main Methods:

  • Acoustic impedance measurements were performed on rats.
  • Rats were cooled from 37°C to 27°C and then rewarmed to 37°C.
  • External canal volume, middle ear pressure, and middle ear compliance were assessed.

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Main Results:

  • Cooling reversibly reduced middle ear compliance.
  • No significant changes were observed in external canal volume or middle ear pressure.
  • The observed decrease in compliance suggests increased stiffness in the tympanic membrane or ossicular chain, or reduced stapes mobility.

Conclusions:

  • Temperature changes affect the conductive properties of the middle ear.
  • Alterations in middle ear stiffness and mobility contribute to the decrease in OAE magnitude during cooling.
  • These findings highlight the sensitivity of auditory mechanisms to thermal variations.