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Experimental Methods to Study Human Postural Control
08:12

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Published on: September 11, 2019

Postural constraints on movement variability.

Daniel R Lametti1, David J Ostry

  • 1Motor Control Lab, Department of Psychology, McGill University, Montreal, Quebec, Canada.

Journal of Neurophysiology
|June 18, 2010
PubMed
Summary
This summary is machine-generated.

Human limb movements show variable endpoint variability, influenced by limb stiffness and postural configuration. Understanding these factors is key to explaining motor control and movement variability.

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Area of Science:

  • Motor control
  • Biomechanics
  • Human movement science

Background:

  • Movement endpoint variability is a fundamental characteristic of human motor control.
  • Previous research indicated that limb stiffness patterns, not target geometry, dictate endpoint variability during reaching movements.
  • The influence of postural configuration on movement variability remained less understood.

Purpose of the Study:

  • To investigate the determinants of movement endpoint variability in more detail.
  • To examine how changes in limb configuration and posture affect movement variability.
  • To elucidate the relationship between limb stiffness, postural configuration, and movement variability.

Main Methods:

  • Subjects performed reaching movements using a robotic manipulandum from various start positions to a circular target.
  • Limb stiffness at movement's end was measured using position-controlled displacements.
  • Endpoint position variability was recorded, and a visual-motor transformation was employed to alter limb configuration and target while keeping visual display constant.

Main Results:

  • Endpoint position variability patterns were not circular but reflected limb stiffness patterns.
  • Variability patterns systematically varied with limb configuration, irrespective of movement direction.
  • Limb stiffness patterns were also dependent on limb configuration.

Conclusions:

  • Postural configuration significantly influences the baseline level of movement variability.
  • Motor control mechanisms can further modulate this variability on top of the configuration-dependent baseline.
  • This study highlights the crucial role of limb mechanics and posture in shaping motor variability.