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Relativistic effects in single-joint voluntary movements.

M L Latash1, S R Gutman, G L Gottlieb

  • 1Department of Physical Medicine and Rehabilitation, Rush Medical College, Chicago, IL 60612.

Biological Cybernetics
|January 1, 1991
PubMed
Summary
This summary is machine-generated.

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Motor control systems exhibit time transformations, similar to relativistic effects, when combining movements. Experiments show a 5%-7% change in oscillation periods, supporting the model of an upper limit on the rate of change for controlled variables.

Area of Science:

  • Motor control
  • Biomechanics
  • Human movement science

Background:

  • The motor control system may have an upper limit on the rate of change for controlled variables.
  • Combining simple motor programs can result in complex, non-linear interactions.

Purpose of the Study:

  • To investigate if the superposition of motor programs leads to time transformations analogous to relativistic effects.
  • To model and experimentally verify distortions in motor control summation.

Main Methods:

  • Subjects performed fast, oscillatory elbow movements superimposed on a smooth elbow flexion.
  • Changes in the oscillation period served as a measure of time transformation.
  • Statistical analysis was used to quantify period changes.

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Main Results:

  • Observed statistically significant changes in the period of oscillations, ranging from 5% to 7% for all subjects.
  • These observed changes align with the predictions derived from the proposed model.

Conclusions:

  • The findings support the hypothesis of an upper limit on the rate of change in motor control.
  • Motor control exhibits time transformation properties, mirroring relativistic principles under specific conditions.