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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...
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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.
The Cochlea01:13

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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.
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...
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.
Functional Brain Systems: Limbic System01:15

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The limbic system, often called the "emotional brain," is a complex set of structures located deep within the brain. The intricate network of the limbic system supports a wide range of psychological functions, from emotional regulation to memory formation and sensory processing. This functional brain region encompasses specific parts of the diencephalon and the cerebrum, integrating the higher mental functions of the cerebral cortex with the primitive emotional responses of the deep brain...

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Combined Shuttle-Box Training with Electrophysiological Cortex Recording and Stimulation as a Tool to Study Perception and Learning
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Relating structure to function: Heschl's gyrus and acoustic processing.

Catherine Warrier1, Patrick Wong, Virginia Penhune

  • 1Department of Communication Sciences and Disorders, Northwestern University, Evanston, Illinois 60208, USA. cwarrier@northwestern.edu

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 9, 2009
PubMed
Summary
This summary is machine-generated.

Human brain anatomy varies. Larger Heschl's gyrus (HG) volumes correlate with distinct auditory processing, linking neuroanatomy to acoustic information processing and potentially impacting language learning.

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Neuroanatomy

Background:

  • Understanding the relationship between human neuroanatomy and brain function is crucial.
  • Normal variations in brain structure and their functional implications are not well understood.
  • Heschl's gyrus (HG) is key to processing auditory information.

Purpose of the Study:

  • To investigate the relationship between anatomical variations in Heschl's gyrus (HG) and auditory cortex function.
  • To determine how HG structure influences the processing of temporal and spectral acoustic information.
  • To establish a link between auditory cortex anatomy and individual differences in acoustic processing.

Main Methods:

  • Anatomical magnetic resonance imaging (MRI) was used to identify and measure right and left HG volumes (gray matter, white matter, total).
  • Asymmetry indices for HG were calculated.
  • Cortical auditory activity in response to noise stimuli varying in temporal and spectral dimensions was assessed and correlated with HG volumetric measurements.

Main Results:

  • Significant anatomical variability in HG was observed.
  • Auditory cortex responses demonstrated leftward lateralization for temporal processing (rate of change) and rightward lateralization for spectral processing.
  • Larger left HG volumes correlated with greater leftward rate-related cortical extent.
  • Larger right HG volumes correlated with greater rightward spectral-related cortical extent.

Conclusions:

  • An explicit link between auditory structure (HG volume) and function (acoustic processing) was established.
  • Individual differences in HG anatomy are associated with variations in temporal and spectral acoustic information processing.
  • Findings suggest implications for understanding language learning and neurodevelopmental variations.