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Related Concept Videos

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.
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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.
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
Anatomy of the Eyeball01:20

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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 end"...
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Related Experiment Video

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Visualizing Visual Adaptation
04:43

Visualizing Visual Adaptation

Published on: April 24, 2017

Visual awareness of objects and their colour.

Michael Pilling1, Angus Gellatly

  • 1Department of Psychology, Oxford Brookes University, Headington Campus, Oxford OX3 0BP, UK. mpilling@brookes.ac.uk

Attention, Perception & Psychophysics
|June 23, 2011
PubMed
Summary

Even when object colors are unknown, people retain some awareness of object presence. However, this location knowledge is limited, especially when specific attribute details are not provided.

Area of Science:

  • Cognitive Psychology
  • Visual Perception

Background:

  • Human visual awareness is limited, especially regarding object attributes like color when objects are occluded.
  • Previous research indicates observers struggle to identify object colors when visual information is incomplete.

Purpose of the Study:

  • To investigate whether observers retain knowledge of object presence at a location even when object attributes (e.g., color) are unknown.
  • To compare knowledge of object presence versus object attributes under different task conditions.

Main Methods:

  • Experiments 1-3 used a two-alternative (yes/no) task to assess knowledge of object presence and color.
  • Experiment 4 employed a three-alternative response task with identical displays to differentiate location and attribute knowledge.
  • Data were analyzed to determine the extent of knowledge regarding object location versus object color.

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Main Results:

  • In two-alternative tasks, knowledge of object presence correlated with knowledge of object color.
  • A three-alternative task revealed a statistically significant, though small, advantage for knowing object locations over knowing object colors.
  • This finding contrasts with previous studies under different experimental conditions.

Conclusions:

  • While observers possess some awareness of object locations even without knowing their attributes, this knowledge is limited.
  • The ability to discern object presence at a location is distinct from, and slightly superior to, identifying specific object attributes when information is incomplete.