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Related Concept Videos

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 and Spatial Vision01:15

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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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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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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
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Gestalt Principles of Perception01:21

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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...
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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.
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Visual Search: How Do We Find What We Are Looking For?

Jeremy M Wolfe1,2,3

  • 1Department of Ophthalmology, Harvard Medical School, Boston, Massachusetts 02115, USA.

Annual Review of Vision Science
|April 23, 2020
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Summary

This review explores how intelligent guidance shapes visual search. It examines the interplay between serial and parallel processing, working memory, and long-term memory in guiding efficient visual search.

Keywords:
foragingparallel processingserial processingvisual attentionvisual searchworking memory

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Perception

Background:

  • Visual search involves identifying targets among distractors.
  • Laboratory tasks simplify real-world search complexities.
  • Real-world search involves complex scenes and multiple targets.

Purpose of the Study:

  • To review intelligent guidance mechanisms in visual search.
  • To explore the collaboration between serial and parallel search processes.
  • To differentiate search templates in working memory and long-term memory.

Main Methods:

  • Literature review of visual search studies.
  • Analysis of cognitive processes underlying search.
  • Examination of memory systems influencing search.

Main Results:

  • Intelligent guidance integrates serial and parallel search strategies.
  • Distinct roles for working memory and long-term memory templates.
  • Understanding factors influencing search termination.

Conclusions:

  • Visual search is guided by sophisticated cognitive mechanisms.
  • Memory systems play a crucial role in efficient target identification.
  • Further research can refine models of visual search guidance.