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Related Concept Videos

The Cochlea01:13

The Cochlea

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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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Anatomy of the Ear01:16

Anatomy of the Ear

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Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...
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Hair Cells01:22

Hair Cells

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Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
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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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The Auditory Ossicles01:11

The Auditory Ossicles

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The auditory ossicles of the middle ear transmit sounds from the air as vibrations to the fluid-filled cochlea. The auditory ossicles consist of two malleus (hammer) bones, two incus (anvil) bones, and two stapes (stirrups), one on each side. These bones develop during the fetal stage and are the ones to ossify first. They are fully mature at birth and do not grow afterward.
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...
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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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Related Experiment Video

Updated: Jul 28, 2025

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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Intracochlear pressure and temporal bone motion interaction under bone conduction stimulation.

Ivo Dobrev1, Flurin Pfiffner1, Christof Röösli1

  • 1Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Zurich, University of Zurich, Frauenklinikstrasse 24, Zurich CH-8091, Switzerland.

Hearing Research
|June 2, 2023
PubMed
Summary
This summary is machine-generated.

Bone conduction stimulation causes complex 3D skull motion. The otic capsule remains rigid at higher frequencies, leading to inertial loading of cochlear fluid, crucial for understanding hearing aid function.

Keywords:
3D laser doppler vibrometry (3D LDV)Bone conductionBone conduction hearing aid (BCHA)Intracochlear pressureTemporal bone motion

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Area of Science:

  • Biomechanics
  • Auditory Neuroscience
  • Medical Devices

Background:

  • Bone conduction (BC) stimulation induces complex 3D motion in the otic capsule and temporal bone, varying with frequency, location, and coupling.
  • The relationship between intracochlear pressure differences and otic capsule motion is not well understood.

Purpose of the Study:

  • To investigate the correlation between 3D motion of the otic capsule and intracochlear pressure during bone conduction stimulation.
  • To analyze how frequency, stimulation location, and coupling affect skull and otic capsule motion.

Main Methods:

  • Experiments were performed on 6 human temporal bone samples from 3 cadaver heads.
  • Stimulation was applied using a bone conduction hearing aid (BCHA) actuator across 0.1–20 kHz at different locations and coupling types.
  • 3D motion was measured on various skull surfaces, and intracochlear pressure was recorded in the scala tympani and scala vestibuli.

Main Results:

  • The otic capsule region remained rigid above 10 kHz, while the skull base deformed above 1–2 kHz.
  • Above 1 kHz, the ratio of differential intracochlear pressure to promontory motion was independent of coupling and location.
  • Stimulation direction did not influence the cochlear response above 1 kHz.

Conclusions:

  • The otic capsule's rigidity at higher frequencies results in inertial loading of cochlear fluid.
  • Further research is needed on the solid-fluid interaction within the otic capsule for improved understanding of BC hearing mechanisms.