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Color Vision

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.

Vision

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.

Photoreceptors and Visual Pathways

Photoreceptors and Visual Pathways

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,...

Anatomy of the Eyeball

Anatomy of the Eyeball

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...

The Retina

The Retina

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.

Visual System

Visual System

Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...

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Determination of Photoreceptor Cell Spectral Sensitivity in an Insect Model from In Vivo Intracellular Recordings

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Published on: February 26, 2016

Evolution of neural computations: Mantis shrimp and human color decoding.

Qasim Zaidi¹, Justin Marshall², Hanne Thoen²

¹Graduate Center for Vision Research, State University of New York, New York;

|June 3, 2015

Summary

Mantis shrimp and primates, despite different visual systems, use similar neural strategies for color identification. Both species employ narrowly tuned cells for interval decoding, revealing convergent evolution in color vision processing.

Keywords:

IT cortex color decoding mantis shrimp photoreceptors primate color vision tuning curves winner-take-all

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Area of Science:

Comparative neurobiology
Vision science
Evolutionary biology

Background:

Mantis shrimp and primates exhibit advanced color vision but possess vastly different visual systems due to distinct evolutionary paths.
Mantis shrimp utilize scanning compound eyes with 12 photoreceptor classes, processing color information early in the visual stream.
Primates have image-focusing eyes with three cone classes, with color decoding occurring later in the visual processing hierarchy.

Purpose of the Study:

To investigate the neural mechanisms underlying color vision decoding in mantis shrimp and primates.
To identify parallels in computational strategies for color identification between these evolutionarily distant species.
To explore convergent evolution in the neural processing of color.

Main Methods:

Comparative analysis of neural pathways involved in color vision.
Examination of photoreceptor classes and their spectral tuning in both species.
Computational modeling of color decoding strategies in mantis shrimp (Stomatopoda) and primates.

Main Results:

Despite differences in eye structure and photoreceptor number, both mantis shrimp and primates employ narrowly tuned neural channels for color processing.
A shared strategy of interval decoding appears to be utilized by both species for color identification.
Convergent computational principles are evident in the color-decoding stages of these disparate visual systems.

Conclusions:

Convergent evolution has led to similar computational strategies for color identification in the brains of mantis shrimp and primates.
Narrowly tuned cells and interval decoding represent a potentially universal neural solution for color vision.
This study highlights functional parallels in neural processing despite significant divergence in sensory organ evolution.