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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.
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Related Experiment Video

Updated: May 28, 2026

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
06:46

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

Visual Contrast Processing is Largely Unaltered during Saccades.

Miguel A García-Pérez1, Eli Peli

  • 1Departamento de Metodología, Facultad de Psicología, Universidad Complutense Madrid, Spain.

Frontiers in Psychology
|October 22, 2011
PubMed
Summary
This summary is machine-generated.

Saccadic suppression, a reduction in vision during eye movements, is minimally affected by active neural processes. This study suggests contrast processing remains largely intact during saccades, challenging existing theories.

Keywords:
contrast detectionintrasaccadic perceptionmagnocellular systempsychometric functionsaccadessaccadic suppression

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Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
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Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments

Published on: January 23, 2017

Related Experiment Videos

Last Updated: May 28, 2026

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
06:46

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity

Published on: March 18, 2019

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
13:00

Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments

Published on: January 23, 2017

Area of Science:

  • Neuroscience
  • Vision Science
  • Psychophysics

Background:

  • Saccadic suppression reduces visual sensitivity during eye movements.
  • Traditionally attributed to passive motion smear or active neural inhibition.
  • Previous studies couldn't isolate active vs. passive contributions.

Purpose of the Study:

  • To investigate the contribution of active neural mechanisms to saccadic suppression.
  • To quantify contrast sensitivity during saccades versus fixation.
  • To differentiate between active and passive sources of visual processing reduction.

Main Methods:

  • Measured psychometric functions for contrast detection using intrasaccadic stimuli.
  • Isolated visual processing during saccades, preventing pre/post-saccadic masking.
  • Compared intrasaccadic detection with fixation detection using similar stimuli.

Main Results:

  • Psychometric functions for detection were similar during saccades and fixation.
  • Only a minor reduction in sensitivity was observed during saccades.
  • Contrast processing appears largely unaltered during saccadic eye movements.

Conclusions:

  • Active neural mechanisms do not seem to play a significant role in saccadic suppression.
  • The findings challenge the notion of substantial neural intervention during saccades.
  • Visual processing, particularly contrast sensitivity, is robust during saccadic eye movements.