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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.

Induction

Induction

An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
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Photoreceptors and Visual Pathways

Photoreceptors and Visual Pathways

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Visual System

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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.

The Retina

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Related Experiment Video

Updated: May 12, 2026

Using the Horseshoe Crab, Limulus Polyphemus, in Vision Research

Using the Horseshoe Crab, Limulus Polyphemus, in Vision Research

Published on: July 3, 2009

Electrical induction of vision.

Edward J Tehovnik¹, Warren M Slocum

¹Brain Institute, UFRN, Natal, RN 59056-450, Brazil. tehovnikej@gmail.com

Neuroscience and Biobehavioral Reviews

|March 29, 2013

Summary

This summary is machine-generated.

Researchers explored what monkeys perceive during electrical stimulation of the primary visual cortex (V1). Findings inform visual percepts in humans and the development of visual prosthetics for the blind.

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Area of Science:

Neuroscience
Ophthalmology
Biomedical Engineering

Background:

Electrical stimulation of the primary visual cortex (V1) can evoke visual percepts.
Understanding these percepts is crucial for developing visual prosthetics.
Previous research has explored electrical stimulation in V1, but a comprehensive understanding of percept induction is lacking.

Purpose of the Study:

To assess visual percepts in monkeys during V1 electrical stimulation.
To correlate findings with electrically evoked visual percepts in human V1.
To investigate factors influencing current detection and information transfer in V1.

Main Methods:

Electrical stimulation of the primary visual cortex (V1) in monkeys.
Visuo-behavioural assessments to determine detection thresholds.
Analysis of electrical, cytoarchitectonic, and behavioural factors.
Exploration of corticofugal mechanisms for visual percept induction.

Main Results:

Identified factors affecting current detection in monkey V1.
Characterized visual percepts evoked by electrical stimulation.
Proposed a corticofugal mechanism for visual percept induction.
Quantified information transfer to V1 via electrical stimulation.

Conclusions:

Electrical stimulation of V1 in monkeys provides insights into human visual percepts.
Findings contribute to understanding the neural basis of vision and visual prosthetics.
Proposed experiments will further elucidate V1 stimulation effects in macaques and humans.