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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
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Vision01:24

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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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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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Parallel Processing01:20

Parallel Processing

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The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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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.
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Photoreceptors and Visual Pathways

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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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3D-Neuronavigation In Vivo Through a Patient's Brain During a Spontaneous Migraine Headache
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Visual processing in migraine.

Louise O'Hare1, Paul B Hibbard2,3

  • 11 School of Psychology, College of Social Science, University of Lincoln, UK.

Cephalalgia : an International Journal of Headache
|November 28, 2015
PubMed
Summary
This summary is machine-generated.

Migraine patients exhibit visual processing differences, including heightened sensitivity to visual noise and altered sensory perception. A signal processing model explains these visual deficits, aiding in understanding the neurological disorder.

Keywords:
Migrainesignal processing modelvision perception

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Area of Science:

  • Neurology
  • Visual Neuroscience
  • Computational Neuroscience

Background:

  • Migraine is a prevalent neurological disorder characterized by visual processing anomalies.
  • These visual differences offer insights into the condition's pathophysiology and potential therapeutic targets.

Purpose of the Study:

  • To review psychophysical findings related to visual processing in migraine.
  • To propose a theoretical signal processing model to explain observed visual deficits.

Main Methods:

  • Literature review of psychophysical experiments on migraine visual perception.
  • Application of an established signal processing model to behavioral data.

Main Results:

  • Migraine is associated with impaired contrast sensitivity, orientation acuity, and perception of form and motion.
  • Migraine visual systems show increased sensitivity to noise, surround suppression, masking, and adaptation.
  • The signal processing model precisely accounts for these observed behavioral differences.

Conclusions:

  • Altered excitation-inhibition balance and increased noise sensitivity explain visual perception differences in migraine.
  • A unified theoretical framework is crucial for advancing the understanding and treatment of migraine.