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Related Concept Videos

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.
The Retina01:32

The Retina

The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
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...
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.
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...

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Updated: Jun 23, 2026

Visualizing Visual Adaptation
04:43

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Published on: April 24, 2017

Color vision, cones, and color-coding in the cortex.

Bevil R Conway1

  • 1Neuroscience Program, Wellesley College, Wellesley, Massachusetts, USA. bconway@wellesley.edu

The Neuroscientist : a Review Journal Bringing Neurobiology, Neurology and Psychiatry
|May 14, 2009
PubMed
Summary
This summary is machine-generated.

The brain processes color through hierarchical stages, starting from cone photoreceptors and progressing through visual cortex areas to construct color perception and integrate it with behavior and emotion.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Color Vision

Background:

  • Color processing begins with light absorption by cone photoreceptors.
  • Visual information travels hierarchically from the retina to higher visual areas.

Purpose of the Study:

  • To outline the hierarchical stages of color processing in the brain.
  • To describe the distinct roles of different visual areas in constructing color perception.

Main Methods:

  • The study reviews the progression of color signals through distinct neural pathways.
  • It examines the functional specialization of neurons in various visual areas (V1, V2, PIT, IT).

Main Results:

  • Trichromacy is based on three cone types.
  • Cone-opponent cells in the retina form the basis of color opponency.
  • Double-opponent neurons in V1 contribute to local color contrast and constancy.
  • Glob cells in PIT elaborate hue perception.
  • Inferior temporal (IT) cortex integrates color with behavior.

Conclusions:

  • Each stage of visual processing constructs a specific aspect of color perception.
  • The visual system builds a complex color percept through a hierarchical cascade.
  • Further research is needed to understand the interface with emotional and motor centers.