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Related Experiment Videos

Spatial coding of visually guided arm movements in primate motor cortex.

A P Georgopoulos1

  • 1Philip Bard Laboratories of Neurophysiology, Department of Neuroscience, Johns Hopkins University, School of Medicine, Baltimore, MD 21205.

Canadian Journal of Physiology and Pharmacology
|April 1, 1988
PubMed
Summary
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Motor cortex cells show directional selectivity, with firing rates peaking for specific movement directions in space. This suggests a key role for the motor cortex in controlling the spatial trajectory of limb movements.

Area of Science:

  • Neuroscience
  • Motor Control
  • Systems Neuroscience

Background:

  • Previous motor cortex studies focused on single-joint, single-axis movements and force.
  • Behaviorally relevant movements involve multi-joint trajectories in extrapersonal space.

Purpose of the Study:

  • To investigate the role of the motor cortex in specifying and controlling the direction of hand movement trajectories in space.
  • To test the hypothesis that motor cortex function is related to the spatial aspects of movement trajectories.

Main Methods:

  • Recorded activity of single cells in the arm area of the motor cortex in behaving monkeys.
  • Monkeys performed movements towards visual targets in various directions in space.

Main Results:

Related Experiment Videos

  • Single motor cortex cells exhibit directional selectivity.
  • Cell discharge intensity correlates with movement direction, peaking at a preferred direction and decreasing for other directions.
  • Cells are broadly tuned around their preferred direction, with variations among individual cells.

Conclusions:

  • The motor cortex plays a significant role in the directional control of movements in space.
  • Directional selectivity of motor cortex cells supports their involvement in specifying movement trajectories.