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Related Concept Videos

Visual System01:26

Visual System

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...
Vision01:24

Vision

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.
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle layer, the vascular tunic,...
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
Parallel Processing01:20

Parallel Processing

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...
Color Vision01:24

Color Vision

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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Updated: Jun 8, 2026

Using Looming Visual Stimuli to Evaluate Mouse Vision
05:07

Using Looming Visual Stimuli to Evaluate Mouse Vision

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Visual system: how does blindsight arise?

Alan Cowey1

  • 1University of Oxford, Department of Experimental Psychology, South Parks Road, Oxford, UK. Alan.Cowey@psy.ox.ac.uk

Current Biology : CB
|September 14, 2010
PubMed
Summary
This summary is machine-generated.

Blindsight allows some patients to perceive visual stimuli despite primary visual cortex damage. Unidentified pathways, possibly involving thalamic Lateral Geniculate Nucleus (LGN) cells, may explain this phenomenon.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Neurobiology

Background:

  • Damage to the primary visual cortex can result in visual field defects.
  • Some individuals exhibit blindsight, the ability to respond to visual stimuli presented in their scotoma without conscious awareness.

Purpose of the Study:

  • To investigate the neural pathways underlying blindsight.
  • To identify the specific cellular mechanisms contributing to blindsight in patients with primary visual cortex lesions.

Main Methods:

  • Review of recent studies and existing literature on blindsight.
  • Analysis of neuroanatomical and functional imaging data (details not specified in abstract).

Main Results:

  • The exact pathways for blindsight remain elusive.
  • Emerging evidence suggests that previously overlooked cells within the thalamic Lateral Geniculate Nucleus (LGN) may play a crucial role.

Conclusions:

  • The thalamic LGN is a potential key area for understanding blindsight.
  • Further research into LGN cell function is warranted to elucidate the mechanisms of blindsight.