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Related Experiment Videos

Monkey superior colliculus activity during short-term saccadic adaptation

M A Frens1, A J Van Opstal

  • 1Department of Medical Physics and Biophysics, University of Nijmegen, The Netherlands.

Brain Research Bulletin
|January 1, 1997
PubMed
Summary
This summary is machine-generated.

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Short-term saccadic adaptation in monkeys shows that neural activity in the Superior Colliculus (SC) dissociates from actual eye movements. This suggests saccadic adaptation occurs downstream from the SC, influencing movement kinematics.

Area of Science:

  • Neuroscience
  • Ophthalmology
  • Motor Control

Background:

  • Saccadic adaptation is a fundamental motor learning process that recalibrates eye movements.
  • The Superior Colliculus (SC) plays a crucial role in generating saccadic eye movements.
  • Understanding the neural basis of saccadic adaptation is key to comprehending motor plasticity.

Purpose of the Study:

  • To investigate the neural mechanisms of short-term saccadic adaptation in rhesus monkeys.
  • To determine the role of the Superior Colliculus (SC) in this adaptation process.
  • To examine how visual input changes affect motor output during saccadic adaptation.

Main Methods:

  • Induced short-term saccadic adaptation using consistent intrasaccadic target displacement in three rhesus monkeys.

Related Experiment Videos

  • Recorded activity of saccade-related burst neurons in the intermediate and deep layers of the SC in two monkeys.
  • Analyzed the relationship between neural activity, saccade kinematics, and target location.

    • Main Results:

    • Saccadic adaptation was specific to a restricted visual field around the target, similar to humans.
    • Adapted saccades in monkeys exhibited altered kinematics, becoming slower and longer in duration compared to non-adapted movements.
    • Superior Colliculus (SC) neural activity reflected the 'required' eye displacement, not the 'actual' saccade made, indicating a dissociation.

    Conclusions:

    • Short-term saccadic adaptation in rhesus monkeys involves a dissociation between SC activity and the executed saccade.
    • Findings suggest that saccadic adaptation occurs at a neural level downstream from the SC.
    • The adaptation process likely influences the kinematic properties of saccadic eye movements.