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Related Experiment Videos

Effects of training on memory-guided saccade performance.

Kristina Visscher1, Elizabeth Viets, Lawrence H Snyder

  • 1Washington University School of Medicine, Washington University, St. Louis, MO 63110, USA.

Vision Research
|July 5, 2003
PubMed
Summary

This study investigated how the brain transforms sensory information into motor commands for memory-guided movements. Findings suggest that motor plans are updated trial-by-trial, but past experiences can influence these transformations.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Motor Control

Background:

  • Sensory-motor transformations are crucial for goal-directed actions.
  • Previous research often uses memory-guided movements to limited targets.
  • It remains unclear if motor plans are generated anew each trial or selected from memorized trajectories.

Purpose of the Study:

  • To investigate the neural mechanisms underlying sensory-motor transformations.
  • To determine whether target locations are directly converted into motor plans on each trial.
  • To explore the influence of prior experience on motor planning.

Main Methods:

  • Well-trained monkeys performed memory-guided saccades (eye movements).
  • Experiments involved both familiar and nearby novel target locations.

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  • Behavioral analysis focused on saccade accuracy and trajectory deviations.

    • Main Results:

    • Saccade performance was similar for familiar and novel targets initially.
    • Novel targets near the vertical meridian showed repulsion from nearby familiar targets.
    • This indicates a dynamic, trial-by-trial sensory-to-motor mapping.

    Conclusions:

    • Sensory-to-motor transformations are likely updated on every trial.
    • Prior experience and learned trajectories can bias ongoing motor planning.
    • This suggests a flexible, experience-dependent motor control system.