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Reference velocity of a human head in bone conduction hearing: Finite element study
Jongwoo Lim1, Ivo Dobrev2, Namkeun Kim1
1Department of Mechanical Engineering, Sogang University, Republic of Korea.
Hearing Research
|January 21, 2023
Summary
The promontory
Area of Science:
- Auditory science
- Biomechanics
- Medical physics
Background:
- Bone conduction (BC) hearing research often assumes the promontory represents specimen motion.
- It's also assumed promontory velocity directly correlates with cochlear response for BC hearing assessment.
Purpose of the Study:
- To validate the assumptions regarding promontory motion representation in bone conduction hearing.
- To investigate the relationship between promontory velocity and cochlear response across different frequencies and directions.
Main Methods:
- Utilized a 3D finite element model of the human head, incorporating the auditory periphery.
- Analyzed velocities at various points on the head for different bone conduction input types and directions.
Main Results:
- A single promontory is inadequate to represent specimen motion due to rotational motion (<0.5 kHz) and localized deformation (>3 kHz).
- Promontory velocity patterns match basilar membrane velocity at low and high frequencies.
- Significant discrepancies in velocity patterns between promontory and basilar membrane occur at mid-frequencies (0.5–3 kHz).
Conclusions:
- The assumption that promontory velocity solely indicates BC hearing ability is questionable.
- Bone conduction hearing assessment requires careful consideration beyond simple promontory velocity measurements.
- Further research is needed to refine BC hearing assessment methods, especially at mid-frequencies.
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