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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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Bone Markings01:26

Bone Markings

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Bones have various surface features that help form joints and attach to other soft tissues. Depending on the function, bone markings are categorized into articulating projections, processes for attachment, depressions, and openings.
Articulating Projections
Articulating projections are found where two bones meet to form a joint. These structures are usually found at the ends of bones. The largest articulation is a rounded projection called the head, supported by a narrow neck at the ends of...
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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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Perception of Sound Waves01:01

Perception of Sound Waves

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The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...
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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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Related Experiment Video

Updated: Mar 6, 2026

Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention
04:32

Sound Source Localization Testing in Single-sided Deafness Following Bone Conduction Intervention

Published on: December 20, 2024

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Morphological differences affect speech transmission over bone conduction.

Kimberly A Pollard1, Phuong K Tran1, Tomasz Letowski1

  • 1United States Army Research Laboratory, 520 Mulberry Point Road, Aberdeen Proving Ground, Maryland 21005-5425, USA.

The Journal of the Acoustical Society of America
|March 4, 2017
PubMed
Summary
This summary is machine-generated.

Individual skull shapes significantly impact bone conduction speech intelligibility. Understanding these craniofacial differences can enhance bone conduction technology for all users.

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Area of Science:

  • Audiology
  • Bioacoustics
  • Craniofacial Anatomy

Background:

  • Bone conduction (BC) bypasses the outer and middle ear, transmitting sound via skeletal vibrations.
  • Individual variations in craniofacial morphology are known but their effect on BC sound transmission is understudied.
  • Speech intelligibility is a key measure for assessing the quality of auditory signals.

Purpose of the Study:

  • To investigate how individual craniofacial morphology affects bone-conducted speech intelligibility.
  • To determine if skull shape influences the perception of bone-conducted sounds at different locations.
  • To provide data for improving BC hearing technologies.

Main Methods:

  • Collected anthropometric craniofacial measurements from 32 participants.
  • Recorded speech using bone microphones on 8 diverse talkers at various skull positions.
  • Assessed speech intelligibility using the Modified Rhyme Test with 24 diverse listeners using BC headphones.

Main Results:

  • Skull morphology significantly influences bone conduction speech intelligibility.
  • The effect of morphology on intelligibility varies depending on the skull location of the bone transducer.
  • Individual differences in craniofacial structure demonstrably alter BC sound transmission.

Conclusions:

  • Craniofacial morphology is a critical factor in bone conduction speech perception.
  • Tailoring BC technology to individual skull shapes can optimize performance.
  • Further research into morphological effects will advance BC hearing aid and communication device design.