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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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Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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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.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex....
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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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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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Photoreceptors and Visual Pathways01:22

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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Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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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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Related Experiment Video

Updated: Jun 27, 2025

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
07:12

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

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Reading instruction causes changes in category-selective visual cortex.

Jason D Yeatman1, Daniel R McCloy2, Sendy Caffarra3

  • 1Graduate School of Education, Stanford University, Stanford, CA, USA; Division of Developmental Behavioral Pediatrics, Stanford University School of Medicine, Stanford, CA, USA; Department of Psychology, Stanford University, Stanford, CA, USA.

Brain Research Bulletin
|April 27, 2024
PubMed
Summary
This summary is machine-generated.

Learning to read rapidly changes visual cortex responses in children. While the visual word form area (VWFA) shows increased responses to words, this does not negatively impact processing of faces or objects.

Keywords:
Category-selectiveEducationHigh-level visual cortexLiteracyNeuronal recyclingPlasticityReadingVisual word form area (VWFA)

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Area of Science:

  • Cognitive Neuroscience
  • Developmental Psychology
  • Neuroscience of Education

Background:

  • Education shapes specialized neural circuits for skills like reading, crucial for modern society.
  • The "Neuronal Recycling" hypothesis posits that learning to read may repurpose brain regions, potentially at the expense of processing other visual stimuli like faces and objects.
  • Understanding early literacy's impact on visual cortex organization is essential.

Purpose of the Study:

  • To investigate whether learning to read alters visual cortex responses, specifically in the ventral occipitotemporal cortex (VOTC).
  • To test the prediction that reading acquisition enhances word responses while decreasing responses to faces and objects.
  • To examine changes induced by early literacy instruction in preschool children.

Main Methods:

  • A randomized controlled trial involving five-year-old children assigned to reading or oral language intervention programs.
  • Magnetoencephalography (MEG) data collected before and after intervention to measure brain activity.
  • Analysis of visual responses to images of text, faces, and objects within category-selective visual cortex regions.

Main Results:

  • Reading versus oral language instruction induced distinct changes in category-selective visual cortex regions.
  • No clear tradeoff was observed between the brain's response to words and its response to other visual categories.
  • Within the visual word form area (VWFA), relative responses to text, faces, and objects changed, but increased word responses were not associated with decreased face or object responses.

Conclusions:

  • Early literacy instruction rapidly modifies high-level visual cortex organization in children.
  • The emergence of reading skills does not appear to occur at the expense of face and object processing.
  • High-level visual cortex undergoes significant, rapid changes as children begin formal schooling and acquire new skills like literacy.