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Related Concept Videos

Visual System01:26

Visual System

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...
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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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 layer, the vascular tunic,...
Color Vision01:24

Color Vision

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.
Parallel Processing01:20

Parallel Processing

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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Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
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Published on: February 8, 2020

Disparity-tuned population responses from human visual cortex.

Benoit R Cottereau1, Suzanne P McKee, Justin M Ales

  • 1The Smith-Kettlewell Eye Research Institute, San Francisco, CA 94115, USA. cottereau@ski.org

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 21, 2011
PubMed
Summary
This summary is machine-generated.

Neural responses to visual disparity were measured across the visual cortex. Different brain regions show varied sensitivity to contextual information, impacting depth perception.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Computational Neuroscience

Background:

  • Understanding how the brain processes visual depth information is crucial for comprehending perception.
  • Neural mechanisms underlying disparity tuning and contextual influences in the visual cortex remain incompletely understood.

Purpose of the Study:

  • To investigate neural population responses to horizontal disparities using source imaging of visual evoked potentials.
  • To examine the impact of binocularly correlated versus uncorrelated surrounds on disparity tuning in distinct visual regions of interest (ROIs).

Main Methods:

  • Measured neural population responses using source imaging of visual evoked potentials across a range of horizontal disparities (0.5-64 arcmin).
  • Utilized a moving central disk stimulus surrounded by either disparity noise or correlated dots.
  • Defined five visual ROIs (V1, human middle temporal area [hMT+], V4, lateral occipital complex [LOC], and V3A) using functional magnetic resonance imaging.

Main Results:

  • Disparity tuning functions peaked between 2 and 16 arcmin in all measured ROIs, irrespective of surround type.
  • Surround correlation modulated response amplitude and phase in hMT+, V4, V3A, and LOC, but not in V1.
  • V3A and LOC showed increased response amplitude when the disk was in front of the surround, suggesting encoding of figure-ground relationships and convexity.

Conclusions:

  • Sensitivity to disparity context is prevalent throughout the visual cortex.
  • The dynamics of contextual interactions in disparity processing vary significantly across different visual areas.
  • Specific regions like V3A and LOC demonstrate specialized processing of figure-ground segregation and object shape based on disparity cues.