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Positional errors introduced by transient perturbations applied to a multi-joint limb.

Mu Qiao1, Tao Zhou1, Mark L Latash1

  • 1Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA.

Neuroscience Letters
|April 18, 2015
PubMed
Summary
This summary is machine-generated.

Transient force perturbations can cause unexpected hand position errors. These errors occur when the bias force increases, suggesting a central nervous system (CNS) drift in the hand

Keywords:
Back-couplingEquifinalityPositional errorsReferent configuration

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Movement Science

Background:

  • Equifinality, the ability to reach a goal via different movement paths, is a key aspect of motor control.
  • Transient perturbations can challenge motor control systems and reveal underlying mechanisms.

Purpose of the Study:

  • To investigate how smooth, transient force perturbations affect hand positioning and equifinality.
  • To determine if muscle properties or central nervous system (CNS) processes underlie observed positional errors.

Main Methods:

  • Healthy subjects performed a task requiring them to maintain a hand position against a bias force.
  • Smooth, transient force perturbations (increasing or decreasing bias force) were applied, with and without a dwell time.
  • Subjects performed the task with eyes open and closed.

Main Results:

  • Consistent positional errors, where the hand stopped short of the initial position, were observed only when the bias force was initially increased.
  • No consistent positional errors were found when the bias force was decreased.
  • Results were consistent across conditions with and without dwell time and vision.

Conclusions:

  • Positional errors are not attributed to muscle viscoelastic properties.
  • Errors reflect a drift in the CNS's internal representation (referent coordinate) of the hand's position.
  • This drift is triggered by the perturbation and influenced by the discrepancy between actual and referent hand coordinates during dwell time.