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Related Concept Videos

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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Anatomy of the Eyeball01:20

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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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Photoreceptors and Visual Pathways01:22

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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 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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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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X-linked Traits01:19

X-linked Traits

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In most mammalian species, females have two X sex chromosomes and males have an X and Y. As a result, mutations on the X chromosome in females may be masked by the presence of a normal allele on the second X. In contrast, a mutation on the X chromosome in males more often causes observable biological defects, as there is no normal X to compensate. Trait variations arising from mutations on the X chromosome are called “X-linked”.
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Visualizing Visual Adaptation
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Sex differences in the human visual system.

John E Vanston1, Lars Strother1

  • 1Department of Psychology, University of Nevada, Reno, Reno, Nevada.

Journal of Neuroscience Research
|November 22, 2016
PubMed
Summary
This summary is machine-generated.

Females and males exhibit distinct visual processing capabilities, indicating they perceive the world differently. Continued research is vital to understand these sex differences in vision and the nervous system.

Keywords:
cerebral lateralityhuman visual systemobject recognitionsex-linked disordersvisual perception

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Area of Science:

  • Neuroscience
  • Vision Science
  • Human Biology

Background:

  • The human visual system exhibits complex processing.
  • Understanding sex-based variations in visual perception is crucial.

Purpose of the Study:

  • To review and synthesize existing research on sex differences in the human visual system.
  • To explore the neural underpinnings of observed visual perception differences between sexes.

Main Methods:

  • Review of behavioral studies.
  • Analysis of neurophysiological data.
  • Examination of neuroimaging findings.

Main Results:

  • Identified sex differences in both basic and high-level visual processing.
  • Evidence suggests females and males process visual information distinctively.
  • Acknowledged controversy and variability in reported sex differences.

Conclusions:

  • Sex differences, even subtle ones, imply divergent visual experiences between sexes.
  • Controversy should drive further validation and research into sex differences in vision.
  • Emphasizes the need for ongoing investigation into sex-based variations in the visual system and nervous system.