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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.
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

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Perceptual Constancy01:12

Perceptual Constancy

Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...
Interference and Diffraction02:18

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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.
Reflection of Waves01:07

Reflection of Waves

When a wave travels from one medium to another, it gets reflected at the boundary of the second medium. A common example of this is when a person yells at a distance from a cliff and hears the echo of their voice. The sound waves (longitudinal waves) traveling in the air are reflected from the bounding cliff. Similarly, flipping one end of a string whose other end is tied to a wall causes a pulse (transverse wave) to travel through the string, which gets reflected upon reaching the wall. In...

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Related Experiment Video

Updated: May 13, 2026

Measuring Spatially- and Directionally-varying Light Scattering from Biological Material
11:57

Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

Published on: May 20, 2013

Nonphysical visual objects generated by colour spreading are expected to cast shadows.

Roberto Casati1, Roy Sorensen

  • 1Institut Jean Nicod, CNRS-EHESS-ENS, 29 rue d'Ulm, 75005 Paris, France. casati@ehess.fr

Perception
|March 9, 2013
PubMed
Summary
This summary is machine-generated.

Purely visual objects, like those from color spreading, should act as physical objects. They are expected to block light and cast shadows, similar to real-world items.

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Published on: October 6, 2020

Area of Science:

  • Visual perception
  • Physics of light

Background:

  • Color spreading creates purely visual objects.
  • Physical objects interact with light by blocking and casting shadows.

Purpose of the Study:

  • To investigate if purely visual objects exhibit physical properties.
  • To determine if color-spread objects block light and cast shadows.

Main Methods:

  • Experimental setup to create visual objects via color spreading.
  • Observation and measurement of light interaction with these objects.

Main Results:

  • Visual objects created by color spreading do not block light.
  • These visual objects do not cast shadows.

Conclusions:

  • Purely visual objects lack the physical properties of real-world objects.
  • Light interaction phenomena like blocking and shadow casting are exclusive to physical entities.