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Saccadic gain modification: visual error drives motor adaptation

J Wallman1, A F Fuchs

  • 1Department of Biology, City College, City University of New York, New York 10031, USA.

Journal of Neurophysiology
|November 18, 1998
PubMed
Summary
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The brain adapts saccadic eye movement accuracy using primarily visual error signals, not motor ones. This adaptation primarily involves motor adjustments, not visual remapping, to maintain precise eye movements.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Motor Control

Background:

  • Saccadic eye movements are crucial for visual perception and are precisely controlled by the brain.
  • The brain adjusts saccade gain based on recent performance to maintain accuracy.
  • The underlying error signals and adaptation mechanisms for saccadic gain adaptation are not fully understood.

Purpose of the Study:

  • To investigate whether the error signal for saccadic gain adaptation is visual or motoric.
  • To determine if saccadic gain adaptation is a motor adjustment or a visual remapping process.
  • To elucidate the mechanisms of saccadic gain adaptation in rhesus macaques and humans.

Main Methods:

  • Used a modified Deubel paradigm to isolate the error signal, replacing corrective saccades.

Related Experiment Videos

  • Employed conventional adaptation to decrease saccade gain and tested it on novel retinal locations.
  • Compared gain adaptation for horizontal saccades versus oblique saccades to assess location specificity.

    • Main Results:

    • Saccadic gain decreased even when corrective saccades were minimal or forward, indicating the error signal is not primarily motoric.
    • Adaptation reduced horizontal saccade gain at non-adapted retinal locations, challenging static visual remapping.
    • Adaptation was less pronounced for oblique saccades compared to horizontal ones, suggesting direction specificity.

    Conclusions:

    • Saccadic gain adaptation relies on a primarily visual error signal, not a motor one.
    • The adaptation process itself is primarily a motor adjustment, not a visual remapping.
    • These findings clarify the neural mechanisms underlying the precise control of eye movements.