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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...

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.

Neuroplasticity

Neuroplasticity

Neuroplasticity reflects the brain's remarkable capacity to adapt and evolve, responding dynamically to learning, experiences, or injury by reorganizing its neural circuitry. This reorganization involves creating new neural connections and refining old ones through a series of biological processes that contribute to the brain's lifelong development and adaptability.

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.

Encoding

Encoding

Information enters the brain through encoding, which is the input of information into the memory system. Once sensory information is received from the environment, the brain labels or codes it. The information is then organized with similar information and connected to existing concepts. Encoding occurs through automatic processing and effortful processing.
Automatic processing involves the encoding of details like time, space, frequency, and the meaning of words, usually done without conscious...

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.

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Related Experiment Video

Updated: Jun 1, 2026

Visualizing Visual Adaptation

Visualizing Visual Adaptation

Published on: April 24, 2017

Adaptation and visual coding.

Michael A Webster¹

¹Department of Psychology, University of Nevada, Reno, NV, USA. mwebster@unr.edu

Journal of Vision

|May 24, 2011

Summary

This summary is machine-generated.

Visual coding adapts dynamically to viewing contexts, influencing perception. Recent studies reveal adaptation across the visual pathway, suggesting common coding principles, though the exact reasons for adaptation remain unclear.

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Area of Science:

Neuroscience
Computational Neuroscience
Visual Perception

Background:

Visual coding is a dynamic process, constantly adjusting to the viewing environment.
Perceptual changes from stimulus adaptation are key to understanding sensory mechanisms and neural plasticity.
Adaptation effects have been observed across multiple levels of the visual system and timescales.

Purpose of the Study:

To analyze the adaptability of visual processing.
To investigate the role of adaptation in visual coding principles.
To explore the underlying reasons for visual adaptation.

Main Methods:

Tracking the effects of adaptation across the visual pathway.
Analyzing perceptual changes resulting from recently viewed stimuli.
Comparing adaptation patterns across various stimulus dimensions.

Main Results:

Visual processing demonstrates greater adaptability than previously recognized.
Adaptation footprints are detectable at both higher and lower visual processing levels.
Similar adaptation patterns across different stimulus features suggest shared coding principles.

Conclusions:

Adaptation is a fundamental aspect of visual coding, playing a central role in how the visual system processes information.
Despite extensive research, the precise functional significance and evolutionary drivers of visual adaptation require further investigation.