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Depth Perception and Spatial Vision01:15

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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 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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A bias in transsaccadic perception of spatial frequency changes.

Nino Sharvashidze1, Carolin Hübner2, Alexander C Schütz1

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

Vision Research
|July 11, 2024
PubMed
Summary

Visual perception changes across saccades, with spatial frequency (SF) appearing higher in the periphery. This study found a bias towards reporting SF increases during saccades, not solely due to response bias.

Keywords:
BlankingMasking/overwritingPeripheral appearanceSpatial frequency perceptionTranssaccadic changeTranssaccadic perception

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Area of Science:

  • Visual neuroscience
  • Perception psychology

Background:

  • Visual processing varies between foveal and peripheral vision.
  • Differences in visual feature appearance across saccades challenge perception.
  • Peripheral spatial frequency (SF) may appear higher than foveal SF.

Purpose of the Study:

  • Investigate the visual appearance of SF before and after saccades.
  • Examine SF change discrimination during saccades.
  • Determine the influence of pre- and postsaccadic information on discrimination.

Main Methods:

  • Experiment 1: Assessed SF appearance pre- and post-saccade, and change discrimination.
  • Experiment 2: Tested SF increase vs. decrease discrimination thresholds.
  • Assessed presaccadic SF discrimination performance.

Main Results:

  • No difference in SF appearance pre- vs. post-saccade, but a bias to report SF increases.
  • Postsaccadic blank improved response precision, not bias.
  • Lower thresholds for SF increases than decreases, indicating a genuine bias.
  • Presaccadic discrimination thresholds were lower than transsaccadic change discrimination thresholds.

Conclusions:

  • Transsaccadic SF change discrimination is not solely limited by peripheral presaccadic vision.
  • The observed bias in change direction may result from postsaccadic stimulus masking or overwriting.