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Related Concept Videos

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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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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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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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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.
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Visualizing Visual Adaptation
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Salience of spatiochromatic patterns.

Amanda C Hardman1,2, Jasna Martinovic1,3,4

  • 1School of Psychology, University of Aberdeen, Aberdeen, UK.

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|April 16, 2021
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Summary
This summary is machine-generated.

Perceived contrast depends on stimulus color and spatial patterns. Bluish stimuli appear more salient than yellowish ones, revealing insights into early visual processing.

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Area of Science:

  • Visual neuroscience
  • Color vision research
  • Perceptual psychology

Background:

  • Understanding perceived contrast is crucial for visual neuroscience.
  • Cone-opponent mechanisms are fundamental to color vision.
  • Spatial distribution influences visual perception.

Purpose of the Study:

  • To investigate how perceived contrast relates to cone-opponent stimulus content and spatial distribution.
  • To compare different tasks for measuring perceived contrast.
  • To explore color asymmetries in perceived contrast.

Main Methods:

  • Participants performed matching tasks to determine iso-salience points for various stimuli (gratings, Gabors, Gaussians).
  • Two tasks were used: two-alternative forced choice (2AFC) and adjustment.
  • Stimuli varied in color (bluish vs. yellowish) and spatial distribution.

Main Results:

  • Adjustment tasks are reliable for measuring perceived contrast of suprathreshold stimuli.
  • Gaussian stimuli required less contrast for equal salience compared to gratings and Gabors.
  • Bluish stimuli exhibited higher perceived salience than yellowish stimuli at equal contrast levels.
  • This bluish-yellowish asymmetry diminished with uniform stimuli, suggesting involvement of spatial frequency channels and opponent neurons.

Conclusions:

  • Perceived contrast is influenced by the interplay of cone-opponent mechanisms, spatial frequency channels, and opponent neurons.
  • Differential neural computations at low levels significantly impact chromatic stimulus perception.
  • Perceived contrast serves as a valuable tool for studying early visual processing.