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A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss
07:12

A Gaze-Contingent Display Framework for Perceptual Learning Research with Simulated Central Vision Loss

Published on: April 11, 2025

The geometry of perisaccadic visual perception.

Alby Richard1, Jan Churan, Daniel E Guitton

  • 1Montreal Neurological Institute, McGill University School of Medicine, Quebec, Canada. alby.richard@mcgill.ca

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|August 14, 2009
PubMed
Summary
This summary is machine-generated.

Perceptual stability during eye movements is maintained by brain mechanisms that compress visual space. This compression, observed during saccadic eye movements, is predicted by a model of logarithmic visual space representation.

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

Published on: March 18, 2019

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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

Area of Science:

  • Neuroscience
  • Vision Science
  • Perception

Background:

  • Maintaining stable perception during eye movements (saccades) is crucial for visual exploration.
  • The visual system employs mechanisms to ensure perceptual stability despite retinal stimulation during gaze shifts.
  • Perisaccadic compression, a misperception of visual probe location during saccades, has been observed but its neural basis is unclear.

Purpose of the Study:

  • To investigate the specific brain mechanisms underlying perisaccadic compression of visual space.
  • To relate the magnitude of perceptual compression to neural representations in the primate brain.
  • To test a heuristic model predicting perisaccadic compression based on retinotopic map geometry.

Main Methods:

  • Laboratory experiments presenting visual probes during saccadic eye movements.
  • Psychophysical measurements of probe location misperception relative to saccade endpoints.
  • Quantitative analysis comparing experimental data to a geometric model of visual space representation.

Main Results:

  • The magnitude of perisaccadic compression was quantitatively predicted across various probe stimuli and saccade amplitudes.
  • A simple heuristic model based on logarithmic retinotopic representations accurately predicted the observed compression.
  • The findings suggest a link between the geometry of visual maps and perceptual stability during eye movements.

Conclusions:

  • Perisaccadic compression is determined by the spatial geometry of visual representations in the brain.
  • A logarithmic map model explains how the brain might confuse nearby oculomotor and sensory signals during saccades.
  • This research provides insight into the neural underpinnings of perceptual stability and visual spatial processing.