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Related Experiment Videos

Control variables and proprioceptive feedback in fast single-joint movement

M F Levin1, Y Lamarre, A G Feldman

  • 1Ecole de réadaptation, Centre de recherche en sciences neurologiques, Institut de réadaptation de Montréal, PQ, Canada.

Canadian Journal of Physiology and Pharmacology
|February 1, 1995
PubMed
Summary

Normal subjects exhibit equifinality in wrist movements, adjusting torque/angle characteristics to maintain consistent final positions despite load changes. A deafferented subject showed inequifinality, highlighting sensorimotor control deficits.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Motor Control

Background:

  • Sensorimotor mechanisms govern movement control through kinematic, electromyographic, and muscle torque data.
  • The torque/angle characteristic describes muscle torque as a function of joint angle, crucial for understanding movement generation.
  • Fast single-joint movements may involve shifts and slope changes in the torque/angle characteristic.

Purpose of the Study:

  • To investigate sensorimotor control mechanisms during fast wrist movements in normal and deafferented subjects.
  • To analyze how load perturbations affect movement control and the torque/angle characteristic.
  • To examine the principle of equifinality in motor control, where movement patterns converge to a consistent outcome.

Main Methods:

  • Kinematic and electromyographic data were collected during voluntary wrist flexions.

Related Experiment Videos

  • Subjects performed movements against a load generated by a torque motor with linear position feedback.
  • Torque/angle characteristics were reconstructed from static wrist positions and torques before and after load removal.

    • Main Results:

    • Normal subjects adjusted their torque/angle characteristic by shifting its position and increasing its slope, demonstrating equifinality.
    • The deafferented subject showed altered torque/angle characteristics and lacked consistent final position reproduction (inequifinality).
    • The deafferented subject exhibited lower maximal stiffness and relied on increasing slope rather than shifting position under load.

    Conclusions:

    • Normal sensorimotor control involves adaptable torque/angle characteristics, ensuring equifinality despite external perturbations.
    • Deafferentation disrupts sensorimotor mechanisms, leading to inequifinality and impaired motor control, potentially due to loss of stretch reflexes.
    • The study underscores the importance of afferent feedback in establishing a stable positional frame of reference for motor commands.