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Related Experiment Videos

A neural network model of sensoritopic maps with predictive short-term memory properties.

J Droulez1, A Berthoz

  • 1Laboratoire de Physiologie Neurosensorielle, Centre National de la Recherche Scientifique, Paris, France.

Proceedings of the National Academy of Sciences of the United States of America
|November 1, 1991
PubMed
Summary

This study presents a neural network model for goal-invariant eye movements, demonstrating how target locations are updated using efferent motor commands. The model successfully memorizes and updates target positions, suggesting similar mechanisms for limb movement control.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Motor Control

Background:

  • Coordinated orienting movements, like ocular saccades, can be performed without direct sensory feedback.
  • Goal-invariance in saccadic eye movements allows targeting memorized locations despite passive subject displacement.

Purpose of the Study:

  • To propose and formalize a neural network model based on the egocentric coordinate hypothesis for goal-invariant orienting movements.
  • To simulate and validate the model's ability to memorize and update target positions.

Main Methods:

  • Development of a formal neural network model incorporating efferent copies of motor commands for continuous updating.
  • Simulation of the network's performance in memorizing and updating target positions using velocity-signal feedback.

Related Experiment Videos

  • Implementation of a learning procedure using intermittent visual afferent signals as a teaching mechanism.

    • Main Results:

    • The simulated neural network successfully memorized target positions in a topologically ordered map.
    • Accurate updating of target positions was achieved through velocity-signal feedback.
    • The network demonstrated a capacity for learning through intermittent visual afferent signals.

    Conclusions:

    • The proposed egocentric model provides a viable mechanism for goal-invariant orienting movements, particularly ocular saccades.
    • Continuous updating of target goals via efferent copies is a plausible strategy for motor control.
    • The findings suggest that similar neural mechanisms may underlie both eye and limb movement control.