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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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Visualizing Visual Adaptation
04:43

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Published on: April 24, 2017

Compatible and incompatible representations in visual sensory storage.

Rishi Bhardwaj1, John D Mollon, Hannah E Smithson

  • 1Department of Psychology, Durham University, UK. dr.rishi.bhardwaj@gmail.com

Journal of Vision
|May 8, 2012
PubMed
Summary
This summary is machine-generated.

The part-report advantage in sensory storage depends on the mask type. High-contrast random digit masks disrupt this advantage, unlike noise or digit-8 masks, suggesting independent visual representations.

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Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Human Memory

Background:

  • Sensory storage exhibits a transient part-report advantage, previously shown to persist against visual noise.
  • The nature of visual sensory storage and how it is affected by masking stimuli remains an area of active research.

Purpose of the Study:

  • To investigate whether the part-report advantage in visual sensory storage is influenced by different types of high-contrast masks.
  • To examine the impact of mask characteristics on the maintenance of visual information.

Main Methods:

  • Participants viewed a 3x4 array of digits as the target stimulus.
  • Masks included noise patterns, arrays of eights, or random digits, presented after varying inter-stimulus intervals (ISIs).
  • An auditory cue was presented at different delays to assess performance via a part-report paradigm.

Main Results:

  • A part-report advantage was observed with noise masks at all ISIs and with digit-8 masks at ISIs >100 ms.
  • This advantage was absent when random digit masks were used.
  • Increasing the delay between the target and cue reduced the measured advantages.

Conclusions:

  • The type of mask significantly impacts the part-report advantage, challenging models of sensory storage as a simple superposition.
  • Independent representations of low-contrast targets can be maintained if masks are sufficiently dissimilar.
  • High-contrast random digit masks prevent the independent access of target representations.