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Thresholds to soft tissue conduction stimulation compared to bone conduction stimulation.

Cahtia Adelman1, Haim Sohmer

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

Audiology & Neuro-Otology
|October 19, 2012
PubMed
Summary
This summary is machine-generated.

This study compared bone conduction (BC) and soft tissue conduction (STC) hearing thresholds. STC thresholds were poorer than BC thresholds and varied with applied force, suggesting different mechanisms.

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Area of Science:

  • Audiology
  • Bioacoustics
  • Hearing Science

Background:

  • Bone conduction (BC) and soft tissue conduction (STC) are methods of auditory stimulation.
  • The relationship between BC and STC, particularly whether STC is a form of BC, requires further investigation.

Purpose of the Study:

  • To compare auditory thresholds using a standard bone vibrator applied to skull bone sites versus soft tissue sites.
  • To assess the influence of static application forces (100 g and 500 g) on BC and STC thresholds.
  • To investigate if STC is a distinct auditory pathway or a variant of BC.

Main Methods:

  • Thresholds to 2.0-kHz tones were measured in dB hearing level using an audiometer in BC mode.
  • Stimulation was applied to skull bone sites (mastoid, forehead) and soft tissue sites (below ear lobe, under chin, sternocleidomastoid muscle).
  • Static application forces of 100 g and 500 g were used for comparison.

Main Results:

  • No significant difference in thresholds was found between 100 g and 500 g forces on skull bone sites.
  • Thresholds at soft tissue sites were significantly poorer with 100 g compared to 500 g.
  • STC thresholds were consistently poorer (higher dB levels) than BC thresholds at both force levels.

Conclusions:

  • Soft tissue conduction (STC) appears to involve different mechanisms than traditional bone conduction (BC).
  • The force applied significantly impacts STC thresholds, unlike BC thresholds.
  • Findings suggest STC may not be solely a form of BC, necessitating distinct consideration in auditory assessment.