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Occlusion Effect in Response to Stimulation by Soft Tissue Conduction-Implications.

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  • 1Speech & Hearing Center, Hebrew University-Hadassah Medical Center, Jerusalem 91200, Israel.

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|December 9, 2020
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Summary
This summary is machine-generated.

The occlusion effect (OE) was found to be similar for bone and soft tissue conduction, being greater at lower frequencies. This suggests vibrations travel through soft tissues to the ear canal, causing hearing.

Keywords:
Bekesybone conductionocclusion effectsoft tissue conductionstethoscope

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Area of Science:

  • Audiology
  • Bioacoustics
  • Physiology

Background:

  • The occlusion effect (OE) is the difference between unoccluded and occluded external ear canal thresholds.
  • Understanding OE mechanisms is crucial for audiological assessments and hearing aid fitting.

Purpose of the Study:

  • To investigate the OE at different conduction sites (bone and soft tissue) and frequencies.
  • To elucidate the transmission pathways of vibrations contributing to OE.

Main Methods:

  • Assessed OE using pure tones (0.5-4.0 kHz) at mastoid, forehead (bone conduction), and under-chin, neck (soft tissue conduction) sites.
  • Analyzed OE differences across conduction sites and frequencies.

Main Results:

  • OE was present at both bone conduction and soft tissue conduction sites with no significant statistical difference.
  • OE was significantly greater at lower frequencies (0.5-1.0 kHz) and diminished at higher frequencies (2.0-4.0 kHz).

Conclusions:

  • Vibrations induced in soft tissues can conduct to the external ear canal, creating air pressure that stimulates the tympanic membrane and inner ear.
  • The findings support the role of soft tissue conduction (STC) in OE, similar to how stethoscopes transmit body sounds for hearing.