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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

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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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Association Areas of the Cortex01:21

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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
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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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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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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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Related Experiment Video

Updated: Oct 26, 2025

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
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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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Cortical magnification in human visual cortex parallels task performance around the visual field.

Noah C Benson1,2, Eline R Kupers1,2, Antoine Barbot1,2

  • 1Department of Psychology, New York University, New York, United States.

Elife
|August 3, 2021
PubMed
Summary
This summary is machine-generated.

Human visual performance shows radial asymmetries. This study reveals cortical magnification patterns in the primary visual cortex mirror these behavioral differences, suggesting a heritable basis for visual field variations.

Keywords:
cortical magnificationfMRIhumanneuroscienceprimary visual cortexretinotopic mapsvisual performance asymmetries

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Area of Science:

  • Neuroscience
  • Human Vision
  • Visual Cortex

Background:

  • Human vision exhibits significant radial asymmetries, with performance varying by stimulus polar angle.
  • These asymmetries are generally stronger on the horizontal meridian and lower vertical meridian.

Purpose of the Study:

  • To investigate cortical magnification at high angular resolution in the human visual cortex.
  • To compare cortical magnification patterns with behavioral performance, retinal cell densities, and heritability.

Main Methods:

  • Measured cortical magnification in 163 human subjects using high angular resolution.
  • Analyzed the spatial distribution of cortical magnification across the visual field.

Main Results:

  • Cortical magnification in the primary visual cortex shows substantial variation, mirroring behavioral asymmetries.
  • Cortical asymmetries are more pronounced than retinal asymmetries and show correlation in monozygotic twins.

Conclusions:

  • A strong link exists between cortical topography and visual behavior.
  • Visual field asymmetries in humans are partly heritable, with cortical magnification playing a key role.