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Related Experiment Video

Updated: Mar 16, 2026

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Saccade plan overlap and cancellation during free viewing.

Esther X W Wu1, Fook-Kee Chua2, Shih-Cheng Yen3

  • 1Singapore Institute for Neurotechnology (SINAPSE), Center for Life Sciences, National University of Singapore, 28 Medical Drive, #05-COR, Singapore 117456, Singapore; Department of Psychology, Faculty of Arts and Social Sciences, National University of Singapore, Block AS4, #02-07, 9 Arts Link, Singapore 117570, Singapore.

Vision Research
|August 16, 2016
PubMed
Summary

The saccadic system can cancel or overlap planned eye movements when visual information changes dynamically. This study shows these mechanisms operate even in free-viewing conditions, not just controlled tasks.

Keywords:
Eye movementFree viewingParallel programmingSaccade programmingScene transition

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Vision Science

Background:

  • Previous research demonstrated saccade plan overlap and cancellation in controlled tasks.
  • Saccade targets were previously limited to experimenter-defined locations.

Purpose of the Study:

  • To investigate saccade plan overlap and cancellation in free-viewing conditions.
  • To determine if dynamic visual changes affect saccadic eye movement planning.

Main Methods:

  • Presented sets of two images sequentially during free viewing.
  • Monitored eye movements to analyze saccade planning and execution.
  • Image 2 was introduced while a saccade plan to an object in Image 1 was potentially ongoing.

Main Results:

  • Saccades were sometimes directed towards objects in Image 2, indicating cancellation of plans for Image 1.
  • Temporal analysis suggested saccade plans overlapped, with preparation for a post-transition saccade starting before the prior saccade was executed.

Conclusions:

  • Saccade plan cancellation and overlap mechanisms are functional in naturalistic free-viewing scenarios.
  • Dynamic changes in visual environments can modulate saccadic system behavior.