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Related Concept Videos

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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Auditory Pathway01:15

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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 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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Hearing01:31

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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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The Auditory Ossicles01:11

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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.
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Echo01:06

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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
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Related Experiment Video

Updated: Mar 26, 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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How Internally Coupled Ears Generate Temporal and Amplitude Cues for Sound Localization.

A P Vedurmudi1, J Goulet1,2, J Christensen-Dalsgaard3

  • 1Physik Department T35 & Bernstein Center for Computational Neuroscience-Munich, Technische Universität München, 85747 Garching bei München, Germany.

Physical Review Letters
|January 30, 2016
PubMed
Summary
This summary is machine-generated.

Internally coupled ears use pressure waves to create unique sound localization cues. These cues, varying with direction, depend on frequency-dependent amplitude and time-difference magnification.

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Related Experiment Videos

Last Updated: Mar 26, 2026

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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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Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process
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Area of Science:

  • Bioacoustics
  • Auditory Neuroscience
  • Computational Biology

Background:

  • Internally coupled ears feature interconnected air-filled passages within the skull.
  • Eardrum displacement in one ear generates pressure waves affecting the other ear.

Purpose of the Study:

  • To model the mechanics of internally coupled ears and their role in sound localization.
  • To investigate how pressure wave propagation generates unique auditory cues.

Main Methods:

  • Developed a computational model simulating eardrum mechanics.
  • Modeled pressure wave propagation through skull air passages.
  • Analyzed the generation of amplitude and temporal cues for sound localization.

Main Results:

  • Internally coupled ears produce unique, directionally dependent amplitude and temporal cues.
  • Tympanic fundamental frequency divides auditory processing into low and high-frequency domains.
  • Low frequencies exhibit constant time-difference magnification; high frequencies show significant amplitude magnification.

Conclusions:

  • The internal coupling mechanism provides sophisticated sound localization capabilities.
  • Frequency-dependent cue magnifications are crucial for precise spatial hearing.