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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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Perceiving Loudness, Pitch, and Location01:21

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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.
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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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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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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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Tinnitus and the Triple Network Model: A Perspective.

Dirk De Ridder1, Sven Vanneste2,3,4, Jae-Jin Song5,6,7

  • 1Section of Neurosurgery, Department of Surgical Sciences, Dunedin School of Medicine, University of Otago, Dunedin, New Zealand.

Clinical and Experimental Otorhinolaryngology
|July 14, 2022
PubMed
Summary
This summary is machine-generated.

The triple network model explains tinnitus disorder by linking abnormal brain network interactions to suffering and disability. This framework helps understand tinnitus comorbidities and develop personalized treatments.

Keywords:
Default Mode NetworkExecutive NetworkSalience NetworkTinnitus

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Auditory Medicine

Background:

  • Tinnitus is the perception of sound without an external source, often leading to suffering.
  • Chronic tinnitus involves distinct 'sound,' 'suffering,' and 'noise-canceling' pathways.
  • Existing models struggle to unify the diverse aspects of tinnitus disorder.

Purpose of the Study:

  • To propose the triple network model as a unifying framework for tinnitus disorder.
  • To explain how interactions between the default mode, salience, and central executive networks contribute to tinnitus.
  • To link these neural networks to tinnitus-related suffering and functional disability.

Main Methods:

  • Conceptual model development integrating existing knowledge of tinnitus pathways and brain networks.
  • Analysis of the proposed overlap between tinnitus pathways and the default mode, salience, and central executive networks.
  • Extension of the triple network model to encompass tinnitus comorbidities.

Main Results:

  • The triple network model integrates the three tinnitus pathways within the default mode, salience, and central executive networks.
  • Abnormal interactions among these networks explain tinnitus-related suffering (salience network) and self-perception changes (default mode network).
  • Interference with the central executive network by tinnitus can lead to functional disability.

Conclusions:

  • The triple network model provides a unifying framework for understanding tinnitus and its associated comorbidities.
  • This model highlights the role of aberrant network interactions in the pathophysiology of tinnitus disorder.
  • The framework supports the development of individualized treatment strategies for tinnitus based on network dysfunction.