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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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Extraretinal signal metrics in multiple-saccade sequences.

Thérèse Collins1

  • 1Laboratoire Psychologie de la Perception, Université Paris Descartes & CNRS, Paris, France. therese.collins@parisdescartes.fr

Journal of Vision
|December 8, 2010
PubMed
Summary

This study reveals that sequential eye movements rely on an internal copy of executed movements. Small errors in this copy accumulate with each movement, increasing variability in memory-guided eye movements.

Area of Science:

  • Neuroscience
  • Oculomotor system research
  • Motor control

Background:

  • Executing sequential memory-guided movements integrates sensory input with prior movement data.
  • The oculomotor system combines extraretinal signals with stored visual target location information.
  • The double-step task is used to investigate extraretinal signal usage in oculomotor planning.

Purpose of the Study:

  • To determine if an extraretinal signal is used in every trial of memory-guided eye movements.
  • To ascertain if extraretinal signal metrics reflect desired or actual eye displacement.
  • To characterize the extraretinal signal as an orbital eye position estimate or a displacement vector.

Main Methods:

  • Utilized the double-step and a multiple-step oculomotor task.

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  • Examined the role of extraretinal signals in planning subsequent saccades.
  • Conducted control experiments to exclude perceptual or memory storage limitations.

    • Main Results:

    • Accurate information from the first saccade, including saccadic adaptation, informs the planning of the second saccade.
    • Endpoint variability increases with the number of saccades in a sequence.
    • Internal copies of executed movements, not perceptual load, explain accumulated variability.

    Conclusions:

    • Each memory-guided movement relies on an internal copy of the executed movement.
    • Accumulating discrepancies in these internal copies increase variability over multiple saccades.
    • This accumulation supports the role of a corollary discharge signal in conveying saccade vector information.