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Related Experiment Videos

Bone conduction experiments in humans - a fluid pathway from bone to ear.

H Sohmer1, S Freeman, M Geal-Dor

  • 1Department of Physiology, Hebrew University-Hadassah Medicla School, Jerusalem, Israel. sohmer@md2.huji.ac.il

Hearing Research
|July 29, 2000
PubMed
Summary

Bone conduction hearing relies on skull contents like the brain and cerebrospinal fluid (CSF), not just bone vibration. This study confirms that vibrations applied anywhere on the head can stimulate the inner ear via these pathways.

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Area of Science:

  • Neuroscience
  • Audiology
  • Otolaryngology

Background:

  • Previous animal studies suggested skull contents mediate bone conduction hearing.
  • The exact pathway for bone conduction stimulation to the inner ear in humans remained unclear.

Purpose of the Study:

  • To test the hypothesis that skull contents are a major pathway for bone conduction in humans.
  • To investigate the necessity of vibrating skull bone for bone conduction responses.

Main Methods:

  • Recorded auditory nerve brainstem evoked responses in neonates via fontanelle stimulation.
  • Obtained audiometric responses in neurosurgical patients with bone vibrator placement over craniotomies.
  • Measured bone vibrator thresholds and vibration magnitude at various head locations.

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Main Results:

  • No threshold differences were found between fontanelle/craniotomy stimulation and skull bone stimulation.
  • Stimulating the eye (a natural craniotomy) yielded similar results to head bone stimulation.
  • Vibration intensity decreased with distance from the stimulation point, indicating skull penetration.

Conclusions:

  • Bone conduction hearing in humans is significantly mediated by vibrations transmitted through skull contents (brain and CSF).
  • Direct bone vibration is not required; vibrations applied to the skin or even the eye can elicit bone conduction responses.
  • Skull penetration by vibrations is key, leading to pressure waves in cerebrospinal fluid that stimulate the inner ear.