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Related Concept Videos

The Cochlea01:13

The Cochlea

The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
Equilibrium and Balance01:15

Equilibrium and Balance

The inner ear assumes dual functionalities of auditory perception and equilibrium maintenance. The vestibule is the organ responsible for balance. This organ contains mechanoreceptors, specifically hair cells, endowed with stereocilia, which aid in deciphering information regarding the position and motion of our heads. Two intrinsic components, the utricle and saccule, help perceive head position, while the semicircular canals track head movement. Neurological messages initiated in the...

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Feasibility analysis of an implantable middle ear cavity pressure microphone.

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The Role of Ear Canal Sound Pressure in Bone Conduction Across Different Bone Conduction Devices.

Otology & neurotology : official publication of the American Otological Society, American Neurotology Society [and] European Academy of Otology and Neurotology·2026
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3D-motion mapping of the malleus-incus complex using a robot-mounted optical coherence tomography vibrometry system.

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Integrated Histology and Molecular Profiling of Postmortem Human Auditory and Vestibular Organs via a Poly (Methyl Methacrylate)-Based Workflow.

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Predicting bone conduction device output using a forehead surface microphone: comparison with promontory motion and intracochlear pressure.

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Longitudinal Analysis of Intracochlear Electrocochleographic Amplitude Patterns in Cochlear Implant Recipients.

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Author Spotlight: Advancements in Impedance Monitoring for Cochlear Implant Surgery
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Suitability of one-axis measurements for quantifying complex cochlear motion under bone conduction stimulation.

Antonio G Bustos1, Ivo Dobrev1, Guy Fierens2

  • 1Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Zürich, Zürich, Switzerland; University of Zürich, Zürich, Switzerland.

Hearing Research
|October 30, 2025
PubMed
Summary

Bone conduction (BC) hearing relies on skull bone vibration. One-dimensional measurements of promontory motion can underestimate BC hearing sensation by up to 16 dB, necessitating 3D measurements for accuracy.

Keywords:
Bone conduction (BC)Bone conduction hearing aid (BCHA)Laser doppler vibrometry (LDV)PromontorySkull surface motion

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Area of Science:

  • Audiology and Bioengineering
  • Otology and Neurotology

Background:

  • Bone conduction (BC) hearing aids treat middle/outer ear pathologies.
  • Accurate measurement of cochlear motion is crucial for estimating BC hearing sensation.
  • Traditional single-beam Laser Doppler Vibrometers (LDV) have limitations in measuring motion deviating from their direction.

Purpose of the Study:

  • To assess the suitability of 1D measurement systems for bone conduction studies.
  • To analyze the influence of motion direction on ipsilateral promontory motion.
  • To determine the accuracy of 1D measurements compared to 3D measurements of skull bone motion.

Main Methods:

  • Literature review of published data on promontory spatial motion.
  • Analysis of 3D accelerometer and 3D LDV data.
  • Evaluation of directional motion influences on bone conduction measurements.

Main Results:

  • Ipsilateral promontory motion direction is significantly influenced by stimulation distance, site, and direction.
  • 1D measurements can underestimate promontory motion magnitude by 4-16 dB (below 1 kHz) and 1-8 dB (above 1 kHz).
  • Underestimation is greatest when stimulation and measurement directions are not aligned.

Conclusions:

  • 1D measurements of bone conduction are insufficient due to complex spatial motion.
  • Three-dimensional measurements are recommended for accurate skull bone motion capture.
  • Accurate motion measurements are vital for clinically relevant metrics like transcranial attenuation.