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Motor control mechanisms. An overview.

E Bizzi1

  • 1Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge.

Neurologic Clinics
|November 1, 1987
PubMed
Summary
This summary is machine-generated.

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Posture and movement control involve the central nervous system (CNS) adjusting muscle activity for equilibrium. However, movement control is more complex than simply reaching a new posture, as trajectory is actively managed.

Area of Science:

  • Neuroscience
  • Biomechanics
  • Motor Control

Background:

  • Recent experiments suggest a link between posture and movement.
  • Posture is thought to arise from the CNS modulating agonist and antagonist muscle activity around a joint.
  • This modulation creates an equilibrium force, with varying ratios for different positions.

Purpose of the Study:

  • To investigate the relationship between posture and movement control.
  • To determine if posture control mechanisms fully explain movement control.
  • To explore the CNS's strategy for controlling limb movement.

Main Methods:

  • Analysis of experimental data on posture and movement.
  • Examination of muscle activity patterns (agonist/antagonist).

Related Experiment Videos

  • Theoretical modeling of length-tension curves and equilibrium forces.

    • Main Results:

    • Posture is achieved by setting muscle activity levels to create equilibrium forces.
    • Movement control involves altering opposing length-tension curves.
    • Experimental evidence shows active trajectory control during movement, not just final position control.

    Conclusions:

    • The vertebrate motor system does not use a simple posture-switching strategy for movement.
    • Active control of movement trajectory is a key component beyond reaching a new equilibrium posture.
    • Understanding motor control requires considering dynamic trajectory adjustments.