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Related Concept Videos

Hearing01:31

Hearing

48.0K
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.
48.0K
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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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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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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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 Perception01:17

Auditory Perception

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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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Related Experiment Video

Updated: May 4, 2026

Neuro-rehabilitation Approach for Sudden Sensorineural Hearing Loss
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Bilateral sudden sensorineural hearing loss: review.

S A Sara1, B M Teh2, P Friedland1

  • 1Department of Otolaryngology, Head, Neck and Skull Base Surgery, Sir Charles Gairdner Hospital, Perth, Western Australia, Australia.

The Journal of Laryngology and Otology
|December 17, 2013
PubMed
Summary

Bilateral sudden sensorineural hearing loss is rare and linked to serious systemic conditions, often resulting in profound hearing loss and a significant mortality rate. Prompt medical evaluation is crucial for these patients.

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Area of Science:

  • Otolaryngology
  • Neurology
  • Internal Medicine

Background:

  • Sudden sensorineural hearing loss (SSNHL) can be unilateral or bilateral, presenting distinct clinical characteristics.
  • Unilateral SSNHL is common, often idiopathic, with good recovery rates.
  • Bilateral SSNHL is rare, frequently associated with severe systemic diseases, and carries higher morbidity and mortality risks.

Purpose of the Study:

  • To review and analyze reported cases of bilateral sudden sensorineural hearing loss.
  • To understand the underlying causes, clinical presentation, and outcomes of bilateral SSNHL.
  • To emphasize the urgent diagnostic and therapeutic implications of bilateral SSNHL.

Main Methods:

  • A comprehensive literature search was performed using PubMed.
  • MeSH terms 'sudden', 'bilateral', and 'sensorineural hearing loss' were utilized.
  • Analysis focused on 103 reported cases of bilateral SSNHL.

Main Results:

  • Bilateral SSNHL is predominantly linked to toxic, autoimmune, neoplastic, and vascular etiologies.
  • A younger age of onset and bimodal age distribution were observed compared to unilateral SSNHL.
  • Patients experienced more profound hearing loss, poorer recovery, and a 35% mortality rate, with fewer vestibular symptoms.

Conclusions:

  • Bilateral sudden onset sensorineural hearing loss constitutes a medical emergency.
  • Urgent and thorough investigation is mandatory to rule out life-threatening and reversible conditions.
  • Early detection and management are critical for improving patient outcomes.