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Related Concept Videos

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.
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.
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,...
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...
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: Jul 12, 2026

Using the Horseshoe Crab, Limulus Polyphemus, in Vision Research
14:28

Using the Horseshoe Crab, Limulus Polyphemus, in Vision Research

Published on: July 3, 2009

Afterimage-like effects in the motion-sensitive neuron H1.

T Maddess

    Proceedings of the Royal Society of London. Series B, Biological Sciences
    |September 22, 1986
    PubMed
    Summary

    Flies exhibit a powerful afterimage effect influencing motion-sensitive neurons, altering movement sensitivity based on visual history. This effect, independent of gain control, impacts neural responses to moving patterns and reduces temporal resolution for moving objects.

    Area of Science:

    • Neuroscience
    • Animal Behavior
    • Sensory Processing

    Background:

    • A previously identified gain control mechanism affects motion detection.
    • Understanding neural processing of visual stimuli is crucial for deciphering sensory systems.

    Purpose of the Study:

    • To investigate a powerful afterimage effect on the motion-sensitive neuron H1 in flies.
    • To characterize the properties and potential neural locus of this afterimage effect.
    • To determine the functional implications of the afterimage on motion perception.

    Main Methods:

    • Electrophysiological recordings from the H1 neuron in response to stationary and moving visual patterns.
    • Systematic variation of stimulus contrast, spatial frequency, and temporal duration.
    • Analysis of H1 neuron's spike rate and directional selectivity.

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    Combined In Vivo Anatomical and Functional Tracing of Ventral Tegmental Area Glutamate Terminals in the Hippocampus
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    Combined In Vivo Anatomical and Functional Tracing of Ventral Tegmental Area Glutamate Terminals in the Hippocampus

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    Related Experiment Videos

    Last Updated: Jul 12, 2026

    Using the Horseshoe Crab, Limulus Polyphemus, in Vision Research
    14:28

    Using the Horseshoe Crab, Limulus Polyphemus, in Vision Research

    Published on: July 3, 2009

    Simultaneous Eye Tracking and Single-Neuron Recordings in Human Epilepsy Patients
    07:43

    Simultaneous Eye Tracking and Single-Neuron Recordings in Human Epilepsy Patients

    Published on: June 17, 2019

    Combined In Vivo Anatomical and Functional Tracing of Ventral Tegmental Area Glutamate Terminals in the Hippocampus
    09:36

    Combined In Vivo Anatomical and Functional Tracing of Ventral Tegmental Area Glutamate Terminals in the Hippocampus

    Published on: September 9, 2020

    Main Results:

    • A novel afterimage effect was demonstrated, altering movement sensitivity based on local stimulus history.
    • The afterimage persisted for up to 2 seconds and saturated at higher contrasts.
    • Spatial frequency tuning and interaction with moving patterns provided insights into the afterimage's neural basis, likely occurring after lateral inhibition.
    • The effect reduced the fly's temporal resolution for moving objects.

    Conclusions:

    • The demonstrated afterimage effect is a distinct neural process, not attributable to photoreceptor light adaptation or pupil mechanisms.
    • This afterimage system plays a significant role in processing low temporal frequencies of moving images.
    • The fly's afterimage system modulates the visibility of moving objects, particularly in areas with slow motion signals.