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Related Experiment Video

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Contributions of gaze-centered and object-centered coding in a double-step saccade task.

Anouk J de Brouwer1, W Pieter Medendorp2, Jeroen B J Smeets3

  • 1Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam, MOVE Research Institute Amsterdam, the Netherlands. a.debrouwer@queensu.ca.

Journal of Vision
|November 16, 2016
PubMed
Summary

Gaze-centered coding, not object-centered, dominates saccade planning. Even with object cues, the Müller-Lyer illusion influenced saccade endpoints, showing a strong reliance on gaze-relative information.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Vision Science

Background:

  • Saccade target localization can be represented in gaze-centered or object-centered coordinates.
  • Understanding coordinate system use is crucial for explaining visually guided movements.

Purpose of the Study:

  • To investigate the roles of gaze-centered and object-centered coding in saccade planning.
  • To determine how coordinate systems are utilized in a double-step saccade task with visual illusion.

Main Methods:

  • A double-step saccade task was employed, incorporating the Brentano Müller-Lyer illusion.
  • Visual targets were presented sequentially (favoring gaze-centered coding) or simultaneously (providing object-centered information).
  • Saccade endpoints were analyzed to assess the influence of coding strategies and the illusion.

Main Results:

  • Saccade endpoints were significantly affected by the Müller-Lyer illusion in both sequential and simultaneous target presentation conditions.
  • This suggests a dominant gaze-centered updating strategy was employed.
  • Reduced saccade endpoint variability was observed with consistent object-centered information, but not with variable object-centered information.

Conclusions:

  • Gaze-centered coding appears to be the dominant strategy for planning sequential saccades.
  • Object-centered information plays a limited role in saccade planning, particularly when its availability is inconsistent.
  • The findings highlight the brain's reliance on gaze-relative frames of reference for rapid motor control.