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Related Concept Videos

The Cochlea01:13

The Cochlea

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.
Auditory Pathway01:15

Auditory Pathway

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 the...
Hearing01:31

Hearing

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.
Unrenewable Cells00:50

Unrenewable Cells

In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of their outer...
Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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 identifying...

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Related Experiment Video

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A Protocol for the Administration of Real-Time fMRI Neurofeedback Training
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Published on: August 24, 2017

Tinnitus does not require macroscopic tonotopic map reorganization.

Dave R M Langers1, Emile de Kleine, Pim van Dijk

  • 1Department of Otorhinolaryngology/Head and Neck Surgery, University Medical Center Groningen, University of Groningen Groningen, Netherlands.

Frontiers in Systems Neuroscience
|February 21, 2012
PubMed
Summary
This summary is machine-generated.

This study found no significant differences in auditory cortex tonotopic maps between tinnitus patients and controls, suggesting macroscopic reorganization is not required for tinnitus with normal hearing. Phantom sound perception in tinnitus may not stem from large-scale brain map changes.

Keywords:
auditory cortexfunctional magnetic resonance imaginghumanstinnitustonotopy

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Medical Imaging

Background:

  • Tinnitus, the perception of phantom sound, is linked to maladaptive plasticity in the central auditory system.
  • Changes in the tonotopic representation of sound within the auditory cortex are hypothesized to underlie tinnitus pathophysiology.

Purpose of the Study:

  • To investigate tonotopic maps in the auditory cortex of individuals with tinnitus and normal hearing.
  • To compare these maps with those of healthy controls to identify potential differences related to tinnitus.

Main Methods:

  • High-resolution functional magnetic resonance imaging (fMRI) was employed.
  • Tonotopic maps were generated and analyzed in 20 tinnitus patients and 20 healthy controls.
  • Dedicated experimental paradigms and data-driven analysis techniques were utilized.

Main Results:

  • Multiple tonotopic gradients were identified in both hemispheres in both groups, consistent with prior research.
  • No significant differences in tonotopic maps were observed between tinnitus patients and controls.
  • No evidence of high-frequency overrepresentation, matching tinnitus pitch, was found.

Conclusions:

  • Macroscopic tonotopic reorganization in the auditory cortex is not a prerequisite for the development of tinnitus.
  • Such large-scale reorganization is not typical in tinnitus cases associated with normal hearing or mild hearing loss.