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Related Experiment Video

Updated: Apr 16, 2026

Investigating the Deployment of Visual Attention Before Accurate and Averaging Saccades via Eye Tracking and Assessment of Visual Sensitivity
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Saccade kinematics modulate perisaccadic perception.

Alessio Fracasso1, Lisandro Kaunitz2, David Melcher3

  • 1Experimental Psychology, Helmholtz Institute, Utrecht University, Utrecht, the Netherlands Center for Mind/Brain Sciences (CIMeC), University of Trento, Trento, Italy.

Journal of Vision
|March 12, 2015
PubMed
Summary
This summary is machine-generated.

Motor commands for eye movements, called efference copy, contain specific details about upcoming saccades. This information influences visual perception even before the eye movement begins, impacting spatial awareness.

Keywords:
kinematicspeak velocityperisaccadic perception

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Perisaccadic mislocalization describes how visual stimuli are spatially misperceived during eye movements.
  • This phenomenon is linked to the efference copy, a motor signal anticipating upcoming saccades.
  • The precise details conveyed by the efference copy (e.g., direction, amplitude, velocity) remain debated.

Purpose of the Study:

  • To determine the specificity of information contained within the efference copy regarding saccade parameters.
  • To investigate whether saccade parameters influence visual perception prior to eye movement execution.

Main Methods:

  • Utilized a perisaccadic unmasking task to assess target discrimination performance around saccade onset.
  • Analyzed the influence of saccade amplitude and peak velocity on visual target perception.
  • Developed a predictive model for efference copy generation incorporating saccade amplitude and velocity.

Main Results:

  • Saccade amplitude and peak velocity significantly modulated target perception, even for pre-saccadic stimuli.
  • The findings support a model where efference copy contains specific saccade parameter information.
  • Perceptual effects were observed even before the saccade was initiated.

Conclusions:

  • The efference copy stores specific details about upcoming eye movements, including amplitude and velocity.
  • This detailed motor information influences visual perception proactively, before saccade execution.
  • These findings refine our understanding of the sensorimotor integration underlying visual perception.