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Related Concept Videos

Vision01:24

Vision

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.
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

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.
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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,...
Lateralization01:28

Lateralization

Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
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...

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Investigating Object Representations in the Macaque Dorsal Visual Stream Using Single-unit Recordings
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Orientation preference and horizontal disparity sensitivity in the monkey visual cortex.

Francisco Gonzalez1, Maria A Bermudez, Ana F Vicente

  • 1Department of Physiology, School of Medicine, University of Santiago de Compostela, Santiago de Compostela, Spain.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|January 6, 2011
PubMed
Summary
This summary is machine-generated.

Visual cortical cells

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Area of Science:

  • Neuroscience
  • Visual processing
  • Computational neuroscience

Background:

  • Disparity sensitivity is crucial for depth perception.
  • Two models explain disparity sensitivity: receptive field (RF) positional differences or interocular shifts of RF subregions.
  • The latter model predicts orientation sensitivity in disparity-tuned cells.

Purpose of the Study:

  • To investigate the relationship between disparity sensitivity and orientation preference in visual cortical cells.
  • To test the hypothesis that disparity-sensitive cells should exhibit orientation selectivity.

Main Methods:

  • Single unit recordings were conducted in areas V1 and V2 of Macaca mulatta.
  • Dynamic random dot stereograms were used to assess disparity sensitivity.
  • Flashing bars at various orientations evaluated orientation sensitivity.

Main Results:

  • No correlation was found between horizontal disparity sensitivity and orientation preference in V1 and V2 cells.
  • These findings challenge the model predicting orientation selectivity based on interocular shifts.

Conclusions:

  • Horizontal disparity sensitivity and orientation preference are independent properties.
  • This supports the model where disparity sensitivity primarily relies on interocular positional differences of receptive fields.