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Related Concept Videos

Vision01:24

Vision

61.8K
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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Color Vision01:24

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.
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Visual System01:26

Visual System

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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...
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The Retina01:32

The Retina

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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.
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Anatomy of the Eyeball01:20

Anatomy of the Eyeball

12.2K
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...
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Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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Visualizing Visual Adaptation
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Vision: efficient adaptive coding.

David Burr1, Guido Marco Cicchini2

  • 1Department of Neuroscience, Psychology, Pharmacology and Child Health, University of Florence, Via S. Salvi 12, Florence, Italy; Neuroscience Institute, National Research Council, Via Moruzzi 1, Pisa 56124, Italy.

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|December 3, 2014
PubMed
Summary
This summary is machine-generated.

Our perception is shaped by current sensory input and recent past experiences. This history helps our brains efficiently process natural scenes by recognizing patterns over time.

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception

Background:

  • Perception is influenced by both current sensory stimuli and recent perceptual history.
  • This suggests efficient neural mechanisms are at play.

Purpose of the Study:

  • To investigate how immediate past sensory information shapes present perception.
  • To understand the role of temporal redundancies in natural scenes for perception.

Main Methods:

  • Analysis of behavioral data in response to visual stimuli.
  • Modeling of neural processes underlying perceptual history effects.

Main Results:

  • Perceptual history significantly influences current sensory processing.
  • Evidence for efficient mechanisms exploiting temporal regularities in visual input.

Conclusions:

  • Immediate past experiences are crucial for present perception.
  • The brain efficiently uses temporal redundancies in natural scenes to optimize perception.