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Related Concept Videos

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.
Hair Cells01:22

Hair Cells

Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
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.
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

Updated: Jun 6, 2026

Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI
10:50

Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI

Published on: February 19, 2014

Functional properties of human auditory cortical fields.

David L Woods1, Timothy J Herron, Anthony D Cate

  • 1Human Cognitive Neurophysiology Laboratory, VANCHCS Martinez, CA, USA.

Frontiers in Systems Neuroscience
|December 17, 2010
PubMed
Summary
This summary is machine-generated.

Human auditory cortex organization mirrors primate models, with distinct core and belt fields. Core fields process sound properties, while belt fields show greater attention modulation, especially in humans for speech processing.

Keywords:
attentioncortical mappingfMRIprimatesound intensitysound locationtonestonotopy

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Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain
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Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain

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Related Experiment Videos

Last Updated: Jun 6, 2026

Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI
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Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain
09:29

Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain

Published on: October 11, 2017

Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Comparative Neuroscience

Background:

  • Human auditory cortical fields (ACFs) remain poorly defined functionally and anatomically.
  • Primate auditory cortex models offer a potential framework for understanding human ACFs.

Purpose of the Study:

  • To investigate if a primate auditory cortex model can explain human fMRI activation patterns.
  • To define boundaries and functional specializations of human ACFs.

Main Methods:

  • fMRI analysis of cortical surface activations to tones (frequency, location, intensity).
  • Defined auditory cortex limits using non-attended sound activations.
  • Mapped and functionally characterized core and belt fields based on primate models.

Main Results:

  • Identified three core ACFs with mirror-symmetric tonotopic organization and surrounding belt fields.
  • Core fields exhibited higher sensitivity to sound properties; belt fields showed greater attentional modulation.
  • Human lateral belt fields are relatively expanded compared to macaques, suggesting a role in speech processing.

Conclusions:

  • The fundamental primate pattern of auditory cortex organization is conserved in humans.
  • Functional distinctions exist between human core and belt fields, and within core fields.
  • Relative expansion of human lateral belt fields highlights their importance in complex auditory processing, like speech.