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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.
Sight Distance in a Vertical Curve01:29

Sight Distance in a Vertical Curve

Sight distance on vertical curves is critical in roadway design. It ensures drivers can see far enough ahead to identify and respond to hazards effectively. This directly impacts safety, driver comfort, and the overall efficiency of the transportation network.Vertical curves are classified into crest and sag curves based on their geometry. For crest curves, sight distance is determined by the line of sight between a driver's eye and a small object on the road's surface. Design parameters for...
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
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,...
Bystander Effect02:09

Bystander Effect

The discussion of bullying highlights the problem of witnesses not intervening to help a victim. This is a common occurrence, as the following well-publicized event demonstrates. In 1964, in Queens, New York, a 19-year-old woman named Kitty Genovese was attacked by a person with a knife near the back entrance to her apartment building and again in the hallway inside her apartment building. When the attack occurred, she screamed for help numerous times and eventually died from her stab wounds.

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Related Experiment Video

Updated: Jun 17, 2026

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition
07:45

Assessing Binocular Central Visual Field and Binocular Eye Movements in a Dichoptic Viewing Condition

Published on: July 21, 2020

Vision: seeing through the gaps in the crowd.

David Whitney1

  • 1The Department of Psychology, The University of California, Berkeley, CA, USA. dwhitney@ucberkeley.edu

Current Biology : CB
|January 13, 2010
PubMed
Summary
This summary is machine-generated.

Our visual system creates an illusion of completeness, despite limited conscious access to details in cluttered scenes. Recent research on crowding phenomenon explains this gap between perceptual limits and our rich visual experience.

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Area of Science:

  • Visual perception
  • Cognitive psychology
  • Neuroscience

Background:

  • Human visual experience often feels complete, yet lacks detailed conscious access to objects in natural, cluttered environments.
  • The 'crowding' phenomenon describes how surrounding elements impede object recognition, highlighting limitations in visual processing.

Purpose of the Study:

  • To investigate the 'crowding' phenomenon in visual perception.
  • To reconcile the discrepancy between the subjective experience of a rich visual world and the objective limitations of perception.

Main Methods:

  • Analysis of recent experimental results on visual crowding.
  • Investigating the relationship between perceptual limitations and subjective visual experience.

Main Results:

  • Emerging findings on visual crowding are beginning to explain how perception handles cluttered scenes.
  • These results bridge the gap between the known limits of visual processing and the feeling of a detailed visual world.

Conclusions:

  • The 'crowding' phenomenon is key to understanding the 'illusion of completeness' in vision.
  • Further research on crowding advances our understanding of visual perception and its subjective qualities.