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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.
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...
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.
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...

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Related Experiment Video

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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

Tonotopic organization of human auditory cortex.

Colin Humphries1, Einat Liebenthal, Jeffrey R Binder

  • 1Department of Neurology, Medical College of Wisconsin, Functional Imaging Research Center, Milwaukee, WI 53226, USA. chumphri@mcw.edu

Neuroimage
|January 26, 2010
PubMed
Summary

This study reveals new insights into human auditory cortex organization. Two primary frequency gradients, oriented perpendicular to Heschl's gyrus, were identified, suggesting evolutionary links with primate auditory processing.

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Neuroimaging

Background:

  • The tonotopic organization of the auditory cortex maps sound frequencies to specific neural locations.
  • Previous assumptions suggested tonotopic gradients in humans were parallel to Heschl's gyrus.

Purpose of the Study:

  • To investigate the precise organization of tonotopic fields in the human auditory cortex.
  • To determine the orientation and extent of frequency gradients within the auditory cortex.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was employed to observe brain activity.
  • Subjects were exposed to multi-tone sequences across six distinct frequency bands (200-6400 Hz).

Main Results:

  • Two mirror-symmetric frequency gradients were identified along the anterior-posterior axis.
  • These gradients extended from a low-frequency sensitive area on Heschl's gyrus towards high-frequency sensitive areas anterior and posterior to it.
  • The principal gradients were oriented perpendicularly to Heschl's gyrus, challenging prior assumptions.

Conclusions:

  • The findings indicate a tonotopic organization in the human auditory cortex with gradients oriented perpendicular to Heschl's gyrus.
  • These results suggest significant homologies between the tonotopic organization of human and nonhuman primate auditory cortices.