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Saccadic adaptation without retinal postsaccadic error.

François Bonnetblanc1, Pierre Baraduc

  • 1INSERM U864 Space and Action, Bron, France.

Neuroreport
|September 1, 2007
PubMed
Summary
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Primary saccades, or initial eye movements, undershoot targets. Even without visual feedback after the movement, the brain adapts to improve accuracy, showing postsaccadic retinal signals stabilize saccadic gain.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Vision Science

Background:

  • Primary saccades, the initial rapid eye movements, typically undershoot their intended targets.
  • Corrective saccades are usually triggered by visual information received after the primary saccade is completed.

Purpose of the Study:

  • To investigate if primary saccades still undershoot their targets when postsaccadic visual information is unavailable.
  • To determine the role of postsaccadic retinal signals in saccadic gain stabilization and error correction.

Main Methods:

  • Participants performed saccades towards targets of varying eccentricities (10-34 degrees).
  • Targets were either continuously illuminated (ON) or extinguished at saccade onset (OFF(Onset)).
  • Eye position was monitored to analyze saccadic gain, corrective saccades, and terminal eye position.

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Main Results:

  • In the OFF(Onset) condition, corrective saccades were rarely observed.
  • Saccadic gain showed an increase over trials for the furthest target (34 degrees).
  • Terminal eye position adapted towards values seen in the ON condition, even without visual feedback.

Conclusions:

  • Postsaccadic retinal signals are crucial for stabilizing saccadic gain.
  • Adaptive changes to reduce terminal saccadic error can occur even in the absence of visual information.
  • The study highlights the brain's ability to recalibrate saccadic motor commands based on internal error signals.