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Related Concept Videos

Vision01:24

Vision

53.0K
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

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.
Once through the pupil, the light passes through the lens, a...
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Visual Agnosia01:12

Visual Agnosia

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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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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...
145
Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

3.1K
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...
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Color Vision01:24

Color Vision

538
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: Jun 12, 2025

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
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Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

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What V1 Damage Can Teach Us About Visual Perception and Learning.

Matthew R Cavanaugh1, Berkeley K Fahrenthold1, Krystel R Huxlin1

  • 1Department of Ophthalmology, Flaum Eye Institute and Center for Visual Science, University of Rochester, Rochester, New York, USA;

Annual Review of Vision Science
|June 10, 2025
PubMed
Summary
This summary is machine-generated.

Occipital strokes damage the primary visual cortex (V1), causing blindness. However, visual retraining can restore vision in blind areas, challenging old beliefs about recovery.

Keywords:
contrast sensitivitymotionorientationperceptual learningplasticityvisual perimetry

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Neurorehabilitation

Background:

  • Occipital strokes frequently damage the primary visual cortex (V1), leading to significant vision loss.
  • Despite the prevalence of V1 damage and visual deficits, effective vision restoration therapies remain limited.
  • Paradoxical preservation of perceptual abilities in blind visual field portions has been observed.

Purpose of the Study:

  • To review advancements in visual retraining therapies for V1-damaged individuals.
  • To explore mechanistic insights gained from visual training studies.
  • To identify current limitations and future opportunities in vision restoration.

Main Methods:

  • Review of scientific literature on visual retraining for V1 damage.
  • Analysis of studies investigating perceptual recovery in blind visual fields.
  • Synthesis of evidence challenging the dogma of permanent V1 damage effects.

Main Results:

  • Visual retraining demonstrates potential for restoring perceptual abilities in V1-damaged individuals.
  • Accumulating evidence challenges the long-held belief that adult visual systems with V1 damage cannot recover.
  • Mechanistic insights into visual recovery are emerging from various training approaches.

Conclusions:

  • Visual retraining offers a promising avenue for vision restoration after occipital strokes.
  • The capacity for recovery in V1-damaged visual systems is greater than previously assumed.
  • Further research into training methods and mechanisms is crucial for clinical translation.