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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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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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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,...
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Related Experiment Video

Updated: May 4, 2026

Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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Perceptual color map in macaque visual area V4.

Ming Li1, Fang Liu, Mikko Juusola

  • 1State Key Laboratory of Cognitive Neuroscience and Learning, Beijing Normal University, Beijing 100871, China, Peking-Tsinghua Center for Life Sciences, School of Life Sciences, and Peking University-International Data Group-McGovern Institute for Brain Research, Peking University, Beijing 100871, China, China State Key Laboratory of Brain and Cognitive Science, Institute of Biophysics, Chinese Academy of Sciences, Beijing 100871, China, and Department of Biomedical Science, University of Sheffield, Sheffield S10 2TN, United Kingdom.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 2, 2014
PubMed
Summary

Researchers mapped color representation in the primate brain

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Color Vision

Background:

  • Trichromatic vision defines colors using 3D spaces like hue-saturation-lightness (HSL).
  • Cortical representation of colors along these dimensions is not well understood.

Purpose of the Study:

  • To investigate how perceptual colors are mapped in visual area V4 of the macaque cortex.
  • To elucidate the neural mechanisms underlying color representation in the brain.

Main Methods:

  • Utilized intrinsic optical imaging and electrophysiology in behaving macaques.
  • Systematically selected color stimuli based on HSL coordinates.

Main Results:

  • Each color activated 1-4 distinct cortical patches within millimeter-sized "globs" in V4.
  • Patches represented different hue or lightness clusters, often following HSL order.
  • Saturation consistently increased activity across all relevant patches for a given color.

Conclusions:

  • The color map in V4 is organized according to the perceptual HSL space.
  • Distributed, combinatorial patterns of multipatch activity represent individual colors.
  • This organization may enhance the color space capacity of cortical maps and aid feature binding.