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Related Concept Videos

Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...
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Auditory Perception01:17

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The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the...
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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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Perception of Sound Waves01:01

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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.
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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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Related Experiment Video

Updated: Apr 6, 2026

Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss
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Sensorineural Hearing Loss: A Changing Paradigm for Its Evaluation.

Asitha D L Jayawardena1, A Eliot Shearer1, Richard J H Smith1,2,3

  • 1Department of Otolaryngology-Head and Neck Surgery, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA.

Otolaryngology--Head and Neck Surgery : Official Journal of American Academy of Otolaryngology-Head and Neck Surgery
|July 29, 2015
PubMed
Summary

Clinicians frequently order genetic testing for sensorineural hearing loss (SNHL), but not uniformly. Early genetic testing can reduce healthcare costs by preventing unnecessary diagnostic tests.

Keywords:
DNA sequencingdeafnessgenetic testinghearing loss

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Area of Science:

  • Otolaryngology
  • Medical Genetics
  • Health Economics

Background:

  • Sensorineural hearing loss (SNHL) evaluation guidelines recommend comprehensive genetic testing.
  • Understanding current clinical practice patterns and cost-effectiveness is crucial for optimizing SNHL patient care.

Observation:

  • An online survey assessed how clinicians evaluate simulated SNHL cases.
  • Practicing clinicians' diagnostic testing choices and associated costs were analyzed.

Findings:

  • Otolaryngologists favored audiometric over genetic testing compared to other specialists.
  • More recent trainees were more likely to order advanced imaging (MRI, ECG).
  • Average patient evaluation cost was $4756, with otolaryngologists incurring higher expenses.

Implications:

  • While genetic testing is increasingly used, its uniform adoption in SNHL evaluation is not yet achieved.
  • Earlier, comprehensive genetic testing could potentially reduce healthcare expenditures by avoiding redundant diagnostic procedures.