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Related Concept Videos

Color Vision01:24

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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Photoreceptors and Visual Pathways01:22

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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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Vision01:24

Vision

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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.
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Anatomy of the Eyeball01:20

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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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The Retina01:32

The Retina

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The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
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UV–Vis Spectroscopy of Conjugated Systems01:32

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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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Visualizing Visual Adaptation
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Visualizing Visual Adaptation

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Unconventional colour vision.

Justin Marshall1, Kentaro Arikawa2

  • 1Queensland Brain Institute, University of Queensland, Australia.

Current Biology : CB
|December 17, 2014
PubMed
Summary
This summary is machine-generated.

Butterflies and stomatopods exhibit unique color vision, with stomatopods employing a satellite-sensor-like mechanism. Distinguishing conventional from unconventional color sensing requires ecological context beyond just spectral sensitivities.

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Area of Science:

  • Comparative physiology
  • Animal behavior
  • Sensory ecology

Background:

  • Butterflies and stomatopods possess unconventional color senses, but their mechanisms differ significantly.
  • Butterflies typically have tri- or tetrachromatic vision with added specialized sub-mechanisms.
  • Stomatopods have evolved a distinct color vision system over millions of years.

Purpose of the Study:

  • To compare and contrast the color vision mechanisms of butterflies and stomatopods.
  • To explore the concept of conventional versus unconventional color sensing in animals.
  • To highlight the importance of ecological context in understanding animal color vision.

Main Methods:

  • Comparative analysis of known color vision systems in butterflies and stomatopods.
  • Discussion of evolutionary divergence in visual processing.
  • Emphasis on the necessity of behavioral observations in natural settings.

Main Results:

  • Stomatopod color vision is highly divergent, likened to satellite sensors.
  • Butterflies show a more conventional approach with added task-specific adaptations.
  • Water fleas (Daphnia) may represent a simpler form of specialized spectral sensing.

Conclusions:

  • Color vision complexity varies greatly, with stomatopods representing a unique evolutionary path.
  • Ecological context and behavioral data are crucial for classifying color vision as conventional or unconventional.
  • Simply counting spectral receptors is insufficient to understand an animal's color perception.