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Related Concept Videos

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 cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
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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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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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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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Related Experiment Video

Updated: Mar 30, 2026

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
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Adaptive Pulvinar Circuitry Supports Visual Cognition.

Holly Bridge1, David A Leopold2, James A Bourne3

  • 1FMRIB Centre, John Radcliffe Hospital, Headington, Oxford OX3 9DU, UK.

Trends in Cognitive Sciences
|November 11, 2015
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Summary

The pulvinar, a large thalamic nucleus, acts as a central forebrain hub. Its connections shape visual cortex organization and visual cognition, especially during development.

Keywords:
humanprimatesuperior colliculusthalamusvisionvisual cortex

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Area of Science:

  • Neuroscience
  • Visual processing
  • Thalamic nuclei

Background:

  • The pulvinar is the largest thalamic nucleus in primates.
  • Its role in vision is primarily studied through its extensive connections with the visual cortex.
  • Pulvinar connectivity exhibits topographic organization but also significant convergence and divergence.

Purpose of the Study:

  • To review recent studies on the pulvinar's role in visual cognition.
  • To elucidate how pulvinar pathways influence the functional organization of the visual cortex.
  • To highlight the impact of pulvinar inputs on visual cortex development.

Main Methods:

  • Review of recent neuroscientific studies.
  • Analysis of pulvinar connectivity mapping in the visual cortex.
  • Examination of pulvinar input from the retina and superior colliculus.

Main Results:

  • The pulvinar functions as a central forebrain hub.
  • Convergent and divergent projections characterize pulvinar connectivity.
  • Modest retinal and superior collicular inputs critically shape visual cortex organization, especially during development.

Conclusions:

  • The pulvinar plays a crucial role in visual cognition.
  • Understanding pulvinar pathways is key to comprehending visual cortex function.
  • The pulvinar's influence is particularly significant in early visual development.