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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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Law of Independent Assortment

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Related Experiment Video

Updated: Feb 23, 2026

Visualizing Visual Adaptation

Visualizing Visual Adaptation

Published on: April 24, 2017

Representing Color Ensembles.

Andrey Chetverikov^1,2,3, Gianluca Campana^4,5, Árni Kristjánsson¹

¹1 Laboratory for Visual Perception and Visuomotor Control, Faculty of Psychology, School of Health Sciences, University of Iceland.

Psychological Science

|September 2, 2017

Summary

This summary is machine-generated.

People can perceive the shape of color distributions, not just their average and spread. This visual system ability helps in understanding complex color environments.

Keywords:

color perception ensemble representation open data open materials priming of pop-out summary statistics visual search

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Area of Science:

Visual perception
Cognitive psychology
Color science

Background:

Color perception research often focuses on uniform colors.
Little is known about how the human visual system represents complex color distributions.

Purpose of the Study:

To investigate how people represent color ensembles.
To introduce a novel method for studying color distribution perception using intertrial learning in visual search.

Main Methods:

Participants engaged in a visual search task, identifying oddly colored diamonds.
Distractor diamonds' colors were drawn from uniform or Gaussian distributions.
Test trials probed internal representations of distractor color distributions.

Main Results:

Response times on test trials indicated a strong correspondence between physical and internal color distributions.
The visual system accurately represents the mean and variance of color distributions.
Surprisingly, the visual system also encodes the specific shape (uniform vs. Gaussian) of color distributions.

Conclusions:

The human visual system possesses a detailed representation of color ensembles.
This capability extends beyond simple statistical properties to include distributional shape.
Understanding color distribution representation offers new insights into visual cognition.