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Related Concept Videos

Color Vision01:24

Color Vision

952
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.
952
Perceptual Constancy01:12

Perceptual Constancy

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Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...
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Related Experiment Video

Updated: Oct 21, 2025

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
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Rapid visual adaptation persists across saccades.

Carolin Hübner1,2, Alexander C Schütz1,3

  • 1Allgemeine und Biologische Psychologie, Philipps-Universität Marburg, 35037 Marburg, Germany.

Iscience
|September 6, 2021
PubMed
Summary

Visual cortex neurons adapt quickly, but perceptual fading is rare. This study shows that adaptation during brief eye fixations impacts vision even after saccades, challenging previous assumptions.

Keywords:
Behavioral neuroscienceClinical neuroscienceSensory neuroscienceTechniques in neuroscience

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Sensory Adaptation

Background:

  • Neurons in the visual cortex adapt rapidly to sustained stimuli, potentially causing perceptual fading.
  • Perceptual fading is uncommon in daily life, possibly due to eye movements refreshing visual input.
  • Large saccades may be scaled to minimize perceptual fading by decorrelating visual input before and after the movement.

Purpose of the Study:

  • To investigate whether adaptation during natural fixation durations affects postsaccadic perception.
  • To test the assumption that adaptation is strong enough to influence perception after visually disruptive saccades.

Main Methods:

  • Measuring the impact of luminance adaptation on contrast perception following saccadic eye movements.
  • Quantifying the temporal dynamics of adaptation effects during brief fixation periods.

Main Results:

  • Postsaccadic contrast perception was significantly influenced by presaccadic luminance adaptation.
  • The observed adaptation effects emerged within 100 milliseconds and lasted for several seconds.
  • Adaptation during natural fixation periods impacts perception even after saccades.

Conclusions:

  • Adaptation within brief natural fixation periods can affect visual perception.
  • This effect persists across visually disruptive saccades, challenging theories that rely solely on saccades to prevent perceptual fading.
  • The findings highlight the resilience of sensory adaptation in naturalistic viewing conditions.