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Related Experiment Videos

Stance does interfere with movement related brain potentials.

B Dimitrov1, G N Gantchev

  • 1Institute of Physiology, Bulgarian Academy of Sciences, Sofia.

Acta Physiologica Et Pharmacologica Bulgarica
|January 1, 1992
PubMed
Summary

Voluntary movements involve preparatory brain activity and muscle adjustments. Study shows body position influences early brain signals (Bereitschaftspotential) before arm movements, suggesting distinct preparatory stages.

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Area of Science:

  • Neuroscience
  • Human Movement Science
  • Electrophysiology

Background:

  • Voluntary upper limb movements are preceded by postural adjustments in leg and trunk muscles.
  • Brain potentials, such as the Bereitschaftspotential, also precede voluntary movements.

Purpose of the Study:

  • To investigate the relationship between postural preadjustment and brain potentials during voluntary upper limb movements.
  • To determine how different body positions affect these preparatory electrophysiological phenomena.

Main Methods:

  • Healthy subjects performed fast forward arm elevation and index finger flexion in three body positions: free standing, sitting, and standing with back support.
  • Electromyographic (EMG) activity and brain potentials (Bereitschaftspotential) were recorded.

Main Results:

  • The Bereitschaftspotential amplitude at 500 msec before EMG onset was higher during sitting for fast arm elevation.
  • No significant differences in Bereitschaftspotential amplitude at 150 msec before movement onset were found across body positions.
  • Index finger flexion did not show differences in Bereitschaftspotential between sitting and standing.

Conclusions:

  • Findings suggest two distinct stages in the motor preparation process.
  • The involvement of postural muscle mass in stance perturbation influences preparatory brain activity during voluntary movement.

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