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Related Concept Videos

Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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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.
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....
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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.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking...
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Vision01:24

Vision

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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Parallel Processing01:20

Parallel Processing

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The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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Hearing01:31

Hearing

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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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Visual System01:26

Visual System

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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
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Related Experiment Video

Updated: May 1, 2026

Assessment of Audio-Tactile Sensory Substitution Training in Participants with Profound Deafness Using the Event-Related Potential Technique
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Assessment of Audio-Tactile Sensory Substitution Training in Participants with Profound Deafness Using the Event-Related Potential Technique

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Enhanced peripheral visual processing in congenitally deaf humans is supported by multiple brain regions, including

Gregory D Scott1, Christina M Karns2, Mark W Dow2

  • 1Brain Development Lab, Department of Psychology, University of Oregon Eugene, OR, USA ; Division of Pulmonary and Critical Care Medicine, Department of Medicine, Oregon Health and Science University Portland, OR, USA.

Frontiers in Human Neuroscience
|April 12, 2014
PubMed
Summary

Congenital deafness enhances peripheral vision processing through neuroplasticity in auditory and visual brain regions. This study reveals how the brain reorganizes to improve vision in deaf individuals, involving multiple sensory areas.

Keywords:
Heschl's gyrusauditory cortexdeaffMRIhumanvisual attention

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Related Experiment Videos

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Area of Science:

  • Neuroscience
  • Sensory processing
  • Neuroplasticity

Background:

  • Congenital deafness is linked to enhanced peripheral visual processing, highlighting neuroplasticity.
  • Neural mechanisms underlying this enhanced vision, particularly the role of the primary auditory cortex, remain unclear.
  • Previous studies faced limitations due to inter-subject variability in auditory cortex anatomy.

Purpose of the Study:

  • To investigate the contribution of the primary auditory cortex and other brain regions to enhanced peripheral vision in congenitally deaf adults.
  • To compare visual processing in peripheral and perifoveal visual fields between deaf and hearing individuals.
  • To elucidate the roles of cross-modal and intramodal plasticity in altered visual perception.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used to compare brain activity in response to peripheral and perifoveal visual stimuli.
  • Participants included congenitally deaf and hearing individuals.
  • Analyses included a region of interest approach focusing on Heschl's gyrus (primary auditory cortex) and whole-brain analyses.

Main Results:

  • Deaf participants showed greater fMRI signal change for peripheral compared to perifoveal stimuli in the primary auditory cortex (Heschl's gyrus).
  • Whole-brain analyses identified differences in extrastriate visual cortex, primary auditory cortex, MT+/V5, and superior-temporal auditory regions.
  • Altered processing was also observed in multisensory/supramodal areas like the posterior parietal cortex and frontal eye fields.

Conclusions:

  • Neuroplasticity in multiple brain systems, including primary auditory cortex, contributes to altered visual processing in congenitally deaf adults.
  • The findings demonstrate cross-modal plasticity involving the auditory cortex in visual processing.
  • The study underscores the brain's remarkable ability to adapt and reorganize sensory functions in response to altered sensory experience.