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Related Concept Videos

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.
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...
The Retina01:32

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.
Anatomy of the Eyeball01:20

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 layer, the vascular tunic,...
Visual System01:26

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...
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.

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Related Experiment Video

Updated: Jun 5, 2026

Using Looming Visual Stimuli to Evaluate Mouse Vision
05:07

Using Looming Visual Stimuli to Evaluate Mouse Vision

Published on: June 13, 2019

Multiple hypothalamic cell populations encoding distinct visual information.

Timothy M Brown1, Jonathan Wynne, Hugh D Piggins

  • 1Faculty of Life Sciences, AV Hill Building, University of Manchester, Manchester M13 9PT, UK.

The Journal of Physiology
|January 13, 2011
PubMed
Summary
This summary is machine-generated.

Mammalian light responses in the hypothalamus are shaped by distinct photoreceptors. This study reveals specialized hypothalamic neurons that encode visual information for circadian rhythms and behavior.

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Electrophysiological Method for Recording Intracellular Voltage Responses of Drosophila Photoreceptors and Interneurons to Light Stimuli In Vivo
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Single-cell RNA-Seq of Defined Subsets of Retinal Ganglion Cells
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Single-cell RNA-Seq of Defined Subsets of Retinal Ganglion Cells

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Related Experiment Videos

Last Updated: Jun 5, 2026

Using Looming Visual Stimuli to Evaluate Mouse Vision
05:07

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Published on: June 13, 2019

Electrophysiological Method for Recording Intracellular Voltage Responses of Drosophila Photoreceptors and Interneurons to Light Stimuli In Vivo
11:42

Electrophysiological Method for Recording Intracellular Voltage Responses of Drosophila Photoreceptors and Interneurons to Light Stimuli In Vivo

Published on: June 19, 2016

Single-cell RNA-Seq of Defined Subsets of Retinal Ganglion Cells
11:26

Single-cell RNA-Seq of Defined Subsets of Retinal Ganglion Cells

Published on: May 22, 2017

Area of Science:

  • Neuroscience
  • Chronobiology
  • Visual Science

Background:

  • Environmental light profoundly impacts mammalian physiology and behavior via the suprachiasmatic nuclei (SCN) and other hypothalamic areas.
  • The precise retinal and central mechanisms governing light-evoked activity in these hypothalamic cells, and the sensory information they convey, remain poorly understood.

Purpose of the Study:

  • To investigate the photoreceptive origins and response properties of hypothalamic neurons using a red cone knockin mouse model (Opn1mwR).
  • To elucidate how different photoreceptor inputs (cones, melanopsin, rods) are processed and encoded by individual hypothalamic neurons.

Main Methods:

  • Utilized multielectrode recordings from the hypothalamus of red cone knockin mice.
  • Analyzed neuronal firing patterns in response to varying light levels and wavelengths to identify photoreceptor contributions.
  • Classified hypothalamic neurons into distinct response types based on their sensitivity to different photoreceptor inputs and light conditions.

Main Results:

  • Identified 'contrast' and 'irradiance' responses in hypothalamic cells, primarily driven by cones and melanopsin, respectively; rods had a lesser influence.
  • Discovered four distinct neuronal response types, with 'sustained' activation being common in the SCN, responding to all photoreceptor classes and exhibiting circadian firing patterns.
  • Found SCN neurons responding only to light transitions (potentially rod-cone contrast signals) and other hypothalamic/thalamic cells solely modulated by melanopsin, suggesting filtered irradiance signaling.

Conclusions:

  • Hypothalamic neurons differentially encode distinct visual information streams from various photoreceptors.
  • Specialized neuronal populations in the hypothalamus and thalamus process visual signals for circadian regulation, behavior, and physiological responses to light.
  • Findings reveal a broader diversity of hypothalamic cell populations encoding visual information than previously recognized.