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Related Experiment Videos

Changes in muscle and cutaneous cerebral potentials during standing.

C Applegate1, S C Gandevia, D Burke

  • 1Department of Neurology, Prince Henry Hospital, School of Medicine, University of New South Wales, Sydney, Australia.

Experimental Brain Research
|January 1, 1988
PubMed
Summary

Posture affects brain signal transmission from the foot. Standing reduces the amplitude of cerebral potentials from both muscle and skin afferents, suggesting cortical involvement in this attenuation.

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Area of Science:

  • Neuroscience
  • Human Physiology
  • Sensory Neuroscience

Background:

  • Understanding how posture influences sensory information processing is crucial for motor control.
  • Previous research has explored postural effects on proprioception, but cortical processing alterations remain less understood.

Purpose of the Study:

  • To investigate the impact of postural changes (sitting vs. standing) on the transmission of sensory signals from the foot to the cerebral cortex.
  • To determine if standing alters the amplitude and latency of cerebral potentials evoked by stimulating mechanoreceptive afferents.

Main Methods:

  • Recorded cerebral potentials using electrical stimulation of the posterior tibial (muscle) and sural (cutaneous) nerves in both sitting and standing postures.
  • Analyzed latencies and amplitudes of early and subcortical components of the evoked potentials.

Related Experiment Videos

  • Compared the effects of standing with voluntary plantar flexion in a sitting position.

    • Main Results:

    • No significant changes in the latencies of early cerebral potential components were observed between postures.
    • Standing led to a 25-35% amplitude reduction in early components (N38-P40, P40-N50) for both muscle and cutaneous afferents.
    • Amplitude attenuation primarily occurred at the cortical level, as subcortical components remained largely unaffected by stance.

    Conclusions:

    • Postural changes, specifically standing, attenuate the amplitude of cerebral potentials evoked by foot afferent stimulation.
    • This attenuation appears to involve cortical processing mechanisms and is influenced by posture-specific factors beyond simple volition.