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Related Concept Videos

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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Vision01:24

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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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Photoreceptors and Visual Pathways01:22

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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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Anatomy of the Eyeball01:20

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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...
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The Retina01:32

The Retina

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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.
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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.
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Visualizing Visual Adaptation
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Brightness-color interactions in human early visual cortex.

Dajun Xing1, Ahmed Ouni2, Stephanie Chen2

  • 1State Key Laboratory of Cognitive Neuroscience and Learning & IDG/McGovern Institute for Brain Research, Beijing Normal University, Beijing 100875, People's Republic of China, dajun_xing@bnu.edu.cn.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|February 6, 2015
PubMed
Summary
This summary is machine-generated.

Brightness and color perception interact in the brain. This study found that brightness-color interactions occur early in the primary visual cortex (V1), influencing how we see colors.

Keywords:
brightnesscVEPcolorinhibitionvisual cortexvisual perception

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • Brightness and color appearance are influenced by their surroundings.
  • Brightness contrast can desaturate colors, a phenomenon observed in color induction and gamut expansion.
  • The precise location of brightness-color interaction in the human brain remains unclear.

Purpose of the Study:

  • To determine where in the cerebral cortex brightness and color signals interact.
  • To test the hypothesis that brightness-color interaction occurs within the primary visual cortex (V1).

Main Methods:

  • Localized brightness-color interaction in human V1 using chromatic visual-evoked potential (c-VEP) recordings.
  • Investigated the role of local brightness contrast versus luminance difference in generating inhibitory signals.

Main Results:

  • Chromatic visual-evoked potential measurements strongly support interaction within V1.
  • Brightness-color interaction originates in a recurrent inhibitory network in V1.
  • The inhibitory signal is driven by local brightness contrast at object boundaries, not overall luminance.

Conclusions:

  • Brightness-color interaction influencing color perception is located in human V1.
  • This interaction involves a recurrent inhibitory network within V1.
  • Local brightness contrast at boundaries is the key driver of this visual processing effect.