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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.
Position-effect Variegation02:32

Position-effect Variegation

In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
Chromatographic Resolution01:15

Chromatographic Resolution

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High-Accuracy Correction of 3D Chromatic Shifts in the Age of Super-Resolution Biological Imaging Using Chromagnon
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Does the chromatic Mach bands effect exist?

Avital Tsofe1, Hedva Spitzer, Shmuel Einav

  • 1Department of Biomedical Engineering, Faculty of Engineering, Tel-Aviv University, Tel-Aviv, Israel. tsofim@gmail.com

Journal of Vision
|September 19, 2009
PubMed
Summary
This summary is machine-generated.

Chromatic Mach bands, a disputed visual illusion, are perceived under iso-luminance conditions. A computational model confirms this chromatic induction effect, challenging previous findings.

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Area of Science:

  • Visual Perception
  • Color Science
  • Computational Neuroscience

Background:

  • The achromatic Mach bands effect is a well-established visual illusion related to brightness perception.
  • The existence and perception of Chromatic Mach bands under controlled conditions have been debated.
  • Previous research suggested Chromatic Mach bands are not perceived under iso-luminance.

Purpose of the Study:

  • To investigate the perception of Chromatic Mach bands under iso-luminance and iso-brightness conditions.
  • To determine the magnitude and variability of the Chromatic Mach bands effect across different stimuli.
  • To test a computational model of color adaptation in predicting Chromatic Mach bands.

Main Methods:

  • Recording observers' eye movements under iso-brightness conditions.
  • Testing observer perception and magnitude of Chromatic Mach bands with various stimuli.
  • Utilizing a computational model of color adaptation to predict observed effects.
  • Analyzing data by measuring deviations from the achromatic point and complementary lines.

Main Results:

  • A variety of Chromatic Mach bands were clearly perceived under iso-luminance and iso-brightness.
  • Observer eye movements were recorded during perception of these bands.
  • The computational model successfully predicted the observed variations in Chromatic Mach bands.
  • Data analysis supported the model's predictions regarding chromatic induction.

Conclusions:

  • Chromatic Mach bands are perceivable under controlled iso-luminance and iso-brightness conditions.
  • The Chromatic Mach bands effect is a specific instance of chromatic induction.
  • Computational models of color adaptation can accurately predict these chromatic effects.