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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.
Photoreceptors and Visual Pathways01:22

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, whereas...
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 layer, the vascular tunic,...
The Retina01:32

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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.
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.

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Related Experiment Video

Updated: May 22, 2026

Simultaneous ex vivo Functional Testing of Two Retinas by in vivo Electroretinogram System
09:16

Simultaneous ex vivo Functional Testing of Two Retinas by in vivo Electroretinogram System

Published on: May 6, 2015

Simultaneous chromatic and luminance human electroretinogram responses.

Neil R A Parry1, Ian J Murray, Athanasios Panorgias

  • 1University of Manchester, Academic Health Science Center, Faculty of Life Sciences, and Vision Science Centre, Manchester Royal Eye Hospital, Oxford Road, Manchester M13 9WH, UK. neil.parry@manchester.ac.uk

The Journal of Physiology
|May 16, 2012
PubMed
Summary
This summary is machine-generated.

This study demonstrates how to simultaneously measure color and brightness signals in the human electroretinogram (ERG) using a novel stimulus. This technique reveals parallel processing in the visual system and interactions between pathways.

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Area of Science:

  • Neuroscience
  • Visual System Physiology
  • Ophthalmology

Background:

  • The primate visual system processes information in parallel.
  • Understanding chromatic and luminance pathways in the human retina is crucial.
  • The electroretinogram (ERG) is a tool for assessing retinal function.

Purpose of the Study:

  • To develop a novel stimulus to simultaneously isolate color (chromatic) and brightness (luminance) signals in the human ERG.
  • To investigate the parallel processing of chromatic and luminance information in the human visual system.
  • To explore potential interactions between post-retinal pathways.

Main Methods:

  • A novel chromatic-achromatic temporal compound stimulus was designed, separating luminance and chromatic modulations at different temporal frequencies.
  • Electroretinograms (ERGs) were recorded from trichromatic and dichromatic subjects (deuteranope and protanope).
  • Analysis focused on fundamental (first harmonic) and second harmonic responses to identify chromatic and luminance pathway activity, respectively.

Main Results:

  • The chromatic component elicited a fundamental response in trichromats, showing low-pass temporal tuning characteristic of parvocellular pathways.
  • Dichromats showed minimal fundamental response, indicating the chromatic stimulus's specificity.
  • The luminance component elicited a second harmonic response in all subjects, exhibiting band-pass temporal tuning typical of magnocellular pathways.

Conclusions:

  • The study successfully demonstrates concurrent ERG recording from human chromatic and luminance pathways.
  • Findings confirm the parallel processing of chromatic and luminance information in the human retina.
  • Differences in ERGs between trichromats and dichromats suggest early-stage interactions between post-retinal pathways.