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Visualizing Visual Adaptation
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Saccadic adaptation shapes perceived size: Common codes for action and perception.

Alexandra Pressigout1, Céline Paeye2, Karine Doré-Mazars2

  • 1Vision Action Cognition Lab, University of Paris Institute of Psychology, Paris, France. alexandra.pressigout@parisdescartes.fr.

Attention, Perception & Psychophysics
|July 30, 2020
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Summary
This summary is machine-generated.

Modifying eye movements (saccades) alters how we perceive object size. This study shows that adapting saccade amplitude changes perceived object size, revealing a link between motor control and visual perception.

Keywords:
Perception and actionSaccadic adaptationVisual perception

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Oculomotor Control

Background:

  • Perceptual and motor systems share common neural codes.
  • Object location perception correlates with oculomotor system changes.
  • The relationship between eye movement adaptation and object size perception is unexplored.

Purpose of the Study:

  • To investigate if altering saccade amplitude affects object size perception.
  • To determine if saccadic adaptation influences the perception of visual object size.
  • To explore the link between motor adaptation and non-location-based perceptual features.

Main Methods:

  • Participants performed saccades towards a target.
  • Saccade amplitude was adapted by stepping the target during movement.
  • Object size perception was measured using psychometric functions before and after adaptation.

Main Results:

  • Saccadic adaptation (decreased saccade amplitude) occurred in the experimental group.
  • A concurrent shift in psychometric functions indicated a decrease in perceived object size.
  • No perceptual changes were observed in the control group with stationary targets.

Conclusions:

  • Motor changes in saccade amplitude co-occur with changes in perceived object size.
  • This suggests a robust link between oculomotor parameters and object perception beyond location.
  • Findings imply shared neural mechanisms underlying motor adaptation and visual feature perception.