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Related Concept Videos

Auditory Pathway01:15

Auditory Pathway

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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.
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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 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.
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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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Hair Cells01:22

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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.
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Motor and Sensory Areas of the Cortex01:14

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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.
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Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain
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Language prediction mechanisms in human auditory cortex.

K J Forseth1, G Hickok2, P S Rollo1

  • 1Vivian L. Smith Department of Neurosurgery, McGovern Medical School, Houston, TX, USA.

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|October 17, 2020
PubMed
Summary
This summary is machine-generated.

Two predictive brain mechanisms in the auditory cortex aid spoken language. One predicts timing in Heschl's gyri, while another in planum temporale aids speech production.

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Cognitive Neuroscience

Background:

  • Spoken language perception and production rely on predictive mechanisms.
  • The precise neural basis of these predictive mechanisms remains incompletely understood.

Purpose of the Study:

  • To investigate the distinct anatomical and functional characteristics of predictive mechanisms in the early auditory cortex.
  • To elucidate the roles of these mechanisms in speech perception and production.

Main Methods:

  • Intracranial recordings from 37 patients using depth probes along the supratemporal plane.
  • Analysis of neural activity during rhythm listening, speech perception, and speech production tasks.
  • Chronometric stimulation of specific auditory cortex regions (Heschl's gyrus and planum temporale).

Main Results:

  • Identified two distinct predictive mechanisms in the early auditory cortex.
  • Mechanism 1 (Heschl's gyri, low-frequency phase) predicts acoustic event timing.
  • Mechanism 2 (planum temporale, high-gamma power) is involved in speech production and suppressed during production.

Conclusions:

  • Heschl's gyrus is crucial for speech perception timing.
  • Planum temporale is selectively involved in speech production.
  • These findings provide neurobiological grounding for cognitive models of spoken language.