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Related Concept Videos

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.
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...
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.
Anatomy of the Ear01:16

Anatomy of the Ear

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...
Pleiotropy01:33

Pleiotropy

Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
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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Isolation and Culture of Primary Cochlear Hair Cells from Neonatal Mice
06:07

Isolation and Culture of Primary Cochlear Hair Cells from Neonatal Mice

Published on: September 15, 2023

Tone deafness: a model complex cortical phenotype.

Timothy D Griffiths1

  • 1Newcastle University. t.d.griffiths@ncl.ac.uk

Clinical Medicine (London, England)
|January 20, 2009
PubMed
Summary
This summary is machine-generated.

Tone deafness, a music perception disorder, stems from deficits in pitch pattern perception. Recent studies reveal structural brain variations in the right hemisphere network, potentially linked to genetic factors.

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Genetics

Background:

  • Tone deafness (congenital amusia) is a music perception disorder, not an output or cognitive deficit.
  • It is increasingly understood as a form of auditory agnosia, specifically affecting pitch pattern recognition.

Purpose of the Study:

  • To deconstruct the phenotype of tone deafness to a causal deficit in pitch pattern perception.
  • To investigate the neural and genetic underpinnings of this disorder.

Main Methods:

  • Analysis of structural cortical variations in individuals with tone deafness.
  • Examination of a right hemisphere network involved in pitch pattern analysis and working memory.
  • Ongoing studies of multiply affected families to identify genetic factors.

Main Results:

  • Demonstrated subtle structural cortical and white matter variations in tone deafness.
  • Identified these changes within a right hemisphere network crucial for pitch processing.
  • Suggests a potential genetic basis for the observed network disruption.

Conclusions:

  • Tone deafness represents a cortical perceptual disorder, likely involving deficits in pitch pattern processing.
  • Structural variations in a specific right hemisphere network are implicated.
  • This disorder may be explained by single genes and serves as a model for complex cortical connectivity disorders like schizophrenia.