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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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Related Experiment Video

Updated: Jun 7, 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

Saccades compress space, time and number.

David C Burr1, John Ross, Paola Binda

  • 1Department of Psychology, Università Degli Studi di Firenze, Via di San Salvi 12, 50135 Firenze, Italy. dave@in.cnr.it

Trends in Cognitive Sciences
|October 26, 2010
PubMed
Summary
This summary is machine-generated.

Saccadic eye movements compress perceived space, time, and number on a shared subjective scale. This shared metric resets before each saccade, likely aiding post-saccadic perception.

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Last Updated: Jun 7, 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

Using Saccadometry with Deep Brain Stimulation to Study Normal and Pathological Brain Function
05:44

Using Saccadometry with Deep Brain Stimulation to Study Normal and Pathological Brain Function

Published on: July 14, 2016

Area of Science:

  • Cognitive neuroscience
  • Perceptual psychology
  • Oculomotor research

Background:

  • A common subjective scale for space, time, and number perception has been proposed.
  • Saccadic eye movements are known to distort spatial and temporal magnitudes.

Purpose of the Study:

  • To investigate whether saccadic eye movements also compress the perception of number.
  • To compare the time course of compression across space, time, and number during saccades.

Main Methods:

  • Utilizing saccadic eye movements as a paradigm to test perceptual compression.
  • Measuring the perceived magnitude of spatial, temporal, and numerical stimuli during saccades.

Main Results:

  • Saccades were found to compress the perceived magnitude of number, similar to space and time.
  • The compression effect for all three attributes peaked at saccadic onset and resolved within approximately 50ms.
  • The time course of compression was remarkably consistent across spatial, temporal, and numerical domains.

Conclusions:

  • The findings support the existence of a common perceptual metric, potentially involving the intraparietal cortex.
  • The results suggest that this common metric is reset before each saccade, possibly to facilitate subsequent perceptual analysis.