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Related Concept Videos

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

Motor and Sensory Areas of the Cortex

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 cortex.
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...

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Related Experiment Video

Updated: Jun 17, 2026

Visualizing Visual Adaptation
04:43

Visualizing Visual Adaptation

Published on: April 24, 2017

Coding and binding of color and form in visual cortex.

Kiley Seymour1, Colin W G Clifford, Nikos K Logothetis

  • 1School of Psychology, University of Sydney, Sydney, NSW 2006, Australia.

Cerebral Cortex (New York, N.Y. : 1991)
|December 19, 2009
PubMed
Summary
This summary is machine-generated.

This study reveals that the visual cortex processes combined color and form information early on. Specific functional units in the brain may represent these complex visual conjunctions.

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Targeted Labeling of Neurons in a Specific Functional Micro-domain of the Neocortex by Combining Intrinsic Signal and Two-photon Imaging
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Targeted Labeling of Neurons in a Specific Functional Micro-domain of the Neocortex by Combining Intrinsic Signal and Two-photon Imaging

Published on: December 12, 2012

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Color and form processing are generally segregated in the visual brain.
  • Emerging evidence suggests early integration of these features.
  • Understanding the neural basis of feature binding is crucial.

Purpose of the Study:

  • To investigate the neural representation of color-form conjunctions in the human visual cortex.
  • To determine if specific color-form combinations are localized within visual areas.
  • To explore the early stages of visual feature binding.

Main Methods:

  • Utilized high-resolution functional magnetic resonance imaging (fMRI).
  • Employed multivariate pattern classification (linear classifiers) on voxel activation patterns.
  • Presented subjects with visual stimuli varying in color (red/green) and form (clockwise/counterclockwise spirals).

Main Results:

  • Color and form information are represented across retinotopically organized visual areas.
  • Distinguished between stimuli with single color-form pairings and double conjunctions.
  • Identified distinct voxels informative for conjunctions versus individual features.
  • Found evidence for separate coding of color-form conjunctions as early as primary visual cortex.

Conclusions:

  • Color-form conjunctions are likely processed by distinct functional units within the visual cortex.
  • This processing occurs early, potentially starting in primary visual cortex.
  • Findings challenge purely segregated models and support early integration theories of visual information processing.