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Related Concept Videos

Vision01:24

Vision

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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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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,...
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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

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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.
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The Retina01:32

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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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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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Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
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Contrast sensitivity, V1 neural activity, and natural vision.

James E Niemeyer1, Michael A Paradiso2

  • 1Department of Neuroscience, Brown University, Providence, Rhode Island.

Journal of Neurophysiology
|November 11, 2016
PubMed
Summary

Visual sensitivity, crucial for sight, is reduced in natural conditions due to rapid adaptation across eye movements (saccades). This impacts brain area V1 responses and overall contrast sensitivity, especially at lower spatial frequencies.

Keywords:
adaptationcontrast responseprimary visual cortexsaccades

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Area of Science:

  • Neuroscience
  • Vision Science
  • Perception

Background:

  • Contrast sensitivity is vital for visual processing and diagnosing visual disorders.
  • Natural vision involves eye movements (saccades), unlike typical lab experiments with fixation.

Purpose of the Study:

  • To test if perceptual contrast sensitivity is lower in natural vision compared to lab settings.
  • To investigate if reduced sensitivity in natural vision correlates with changes in V1 neural activity.

Main Methods:

  • Simultaneously measured contrast sensitivity and neural contrast response functions.
  • Compared measurements under laboratory fixation conditions versus naturalistic conditions with saccades.
  • Analyzed activity in the primary visual cortex (V1).

Main Results:

  • Contrast sensitivity and V1 activity are correlated in both lab and naturalistic settings.
  • Naturalistic conditions showed up to 25% lower contrast sensitivity, particularly at low spatial frequencies.
  • This reduction correlated with decreased V1 responses, suggesting rapid adaptation across saccades.

Conclusions:

  • Rapid adaptation across saccades significantly influences visual sensitivity in natural vision.
  • This adaptation process, observed in V1, explains reduced contrast sensitivity during natural viewing.
  • Findings highlight the impact of natural viewing dynamics on visual perception.