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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

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.
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...
Gestalt Principles of Perception01:21

Gestalt Principles of Perception

Gestalt principles provide a framework for understanding how humans perceive objects as unified wholes within their context. These principles are essential in explaining the cognitive processes that make sense of complex visual stimuli by organizing them into coherent groups. One fundamental principle is proximity, which posits that objects located close to each other are perceived as a collective group. For instance, when dots are positioned near one another, the visual system interprets them...
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,...
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.

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Using Informational Connectivity to Measure the Synchronous Emergence of fMRI Multi-voxel Information Across Time
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Object-level visual information gets through the bottleneck of crowding.

Jason Fischer1, David Whitney

  • 1Department of Psychology, 3210 Tolman Hall, University of California, Berkeley, CA 94720, USA. jtf@berkeley.edu

Journal of Neurophysiology
|June 17, 2011
PubMed
Summary

Crowding in vision does not break down complex objects like faces into basic features. Holistic face properties can still influence perception even when the face itself cannot be recognized.

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Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Visual perception

Background:

  • Natural scenes contain clutter, limiting object recognition in peripheral vision.
  • Crowding is a primary constraint on object identification outside the fovea.
  • Existing theories suggest crowding dismantles objects into features, losing holistic information.

Purpose of the Study:

  • To investigate whether crowding destroys high-level object representations.
  • To determine if holistic properties of crowded objects influence perception.

Main Methods:

  • Presenting crowded visual stimuli, including faces.
  • Analyzing the contribution of holistic attributes to perceived averages.

Main Results:

  • Faces can survive crowding, retaining holistic attributes.
  • Crowded faces influenced the perceived average despite being unrecognizable.
  • High-level object representations are not dismantled by crowding.

Conclusions:

  • Crowding does not reduce complex objects to component features.
  • Holistic object properties can persist even when recognition is impaired.
  • Visual processing preserves some high-level information under crowding conditions.