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Related Concept Videos

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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Visual System01:26

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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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Visual Agnosia01:12

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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
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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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Association Areas of the Cortex01:21

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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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Color Vision01:24

Color Vision

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Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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Related Experiment Video

Updated: Mar 2, 2026

Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
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Development of visual category selectivity in ventral visual cortex does not require visual experience.

Job van den Hurk1,2, Marc Van Baelen3,4, Hans P Op de Beeck3

  • 1Laboratory of Biological Psychology, Faculty of Psychology and Educational Sciences, Katholieke Universiteit Leuven, 3000 Leuven, Belgium; job.vandenhurk@maastrichtuniversity.nl.

Proceedings of the National Academy of Sciences of the United States of America
|May 17, 2017
PubMed
Summary
This summary is machine-generated.

Brain organization in the ventral-temporal cortex (VTC) develops independently of visual experience. Even without sight, the VTC shows category selectivity using sound, mirroring visual processing in sighted individuals.

Keywords:
blindnesscategory perceptionfunctional MRIpattern analysisventral-temporal cortex

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Sensory Processing

Background:

  • Functional brain organization is thought to heavily rely on sensory input.
  • The ventral-temporal cortex (VTC) is a key visual-processing region crucial for category selectivity.

Purpose of the Study:

  • To investigate the extent to which functional brain organization, specifically category selectivity in the VTC, depends on visual experience.
  • To determine if the VTC's organizational properties develop independently of visual input.

Main Methods:

  • fMRI study involving 14 congenitally blind participants and 20 healthy controls.
  • Presentation of natural sounds (face, body, scene, object) to blind participants and both auditory and visual stimuli to controls.
  • Utilized macroanatomical alignment, response mapping, and surface-based multivoxel pattern analysis.

Main Results:

  • VTC in blind individuals exhibited robust discriminatory responses to sounds across four categories.
  • Activity patterns in the VTC of blind subjects successfully predicted visual categories in sighted controls.
  • Selectivity for auditory stimuli in the visual cortex was unexpectedly stronger in blind individuals compared to controls.

Conclusions:

  • The fundamental organizational property of category selectivity in the ventral-temporal cortex develops independently of visual experience.
  • The cortical response layout in the VTC shows striking similarity between blind and sighted individuals, suggesting a visual-experience-independent organization.
  • While primary visual and auditory cortices processed sounds, they did not sustain cross-modal generalization, unlike the VTC.