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Related Concept Videos

The Cochlea01:13

The Cochlea

51.6K
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.
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Sound Waves01:01

Sound Waves

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Sound waves can be thought of as fluctuations in the pressure of a medium through which they propagate. Since the pressure also makes the medium's particles vibrate along its direction of motion, the waves can be modeled as the displacement of the medium's particles from their mean position.
Sound waves are longitudinal in most fluids because fluids cannot sustain any lateral pressure. In solids, however, shear forces help in propagating the disturbance in the lateral direction as well....
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Hearing01:31

Hearing

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When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
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Auditory Pathway01:15

Auditory Pathway

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Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
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Articles linked to this work by shared authors, journal, and citation graph.

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Effects of fundamental-frequency separation and spatial configuration on speech intelligibility in the mid-sagittal plane under bone-conduction stimulation.

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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.

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Related Experiment Video

Updated: Feb 22, 2026

Behavioral Determination of Stimulus Pair Discrimination of Auditory Acoustic and Electrical Stimuli Using a Classical Conditioning and Heart-rate Approach
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Behavioral Determination of Stimulus Pair Discrimination of Auditory Acoustic and Electrical Stimuli Using a Classical Conditioning and Heart-rate Approach

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Sound wave propagation on the human skull surface with bone conduction stimulation.

Ivo Dobrev1, Jae Hoon Sim1, Stefan Stenfelt2

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

Hearing Research
|October 2, 2017
PubMed
Summary

Bone conduction hearing stimulates the inner ear via skull vibrations. This study found skull bone motion is rigid-body-like at low frequencies but becomes transverse traveling waves above 2 kHz.

Keywords:
3D laser Doppler vibrometryBone conductionFull-field measurementsHuman cadaver headRigid body motionTransverse deformationWave propagation

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Area of Science:

  • Biomechanics
  • Auditory Neuroscience
  • Biomedical Engineering

Background:

  • Bone conduction (BC) offers an alternative to air conduction for inner ear stimulation.
  • BC stimulation propagates to the cochlea via skull bone and other cranial structures.
  • Investigating wave propagation on the skull surface during BC is crucial for understanding auditory stimulation.

Purpose of the Study:

  • To investigate skull bone surface wave propagation during bone conduction (BC) stimulation.
  • To analyze vibration patterns at the forehead and mastoid locations.
  • To characterize the frequency-dependent mechanical response of the human skull.

Main Methods:

  • Measurements were conducted on five human cadaveric heads.
  • A bone-anchored hearing aid (BAHA) transducer was used for stimulation at the mastoid and forehead.
  • Skull vibrations were measured using scanning laser Doppler vibrometry (SLDV) and 3D LDV systems.

Main Results:

  • Rigid-body-like motion dominated below 1 kHz, while transverse traveling waves were observed above 2 kHz.
  • Surface wave propagation speeds reached approximately 450 m/s at 8 kHz.
  • 3D velocity measurements confirmed complex, frequency-dependent skull responses, with normal motion dominant above 2 kHz.

Conclusions:

  • Skull bone vibration during BC exhibits distinct low-frequency rigid-body motion and high-frequency traveling waves.
  • Transverse deformations and surface waves are significant above 2 kHz, with speeds around 450 m/s at 8 kHz.
  • Understanding these wave propagation dynamics is key for optimizing BC hearing aid technology.