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Related Experiment Videos

Postural reflexes evoked by tapping forehead and chest.

K Bötzel1, P Feise, O I Kolev

  • 1Department of Neurology, Ludwig-Maximilians-Universität, Munich, Germany. kboetzel@brain.nefo.med.uni-muenchen.de

Experimental Brain Research
|July 24, 2001
PubMed
Summary

A forehead tap can trigger leg muscle reflexes, even without vestibular function, indicating multisensory pathways are involved. These reflexes help counteract postural instability caused by the tap.

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Area of Science:

  • Neuroscience
  • Human Physiology
  • Biomechanics

Background:

  • The vestibular system is crucial for balance and postural control.
  • Reflexes help maintain upright stance against perturbations.
  • The role of multisensory integration in tap-evoked reflexes is not fully understood.

Purpose of the Study:

  • To determine if forehead tapping elicits leg muscle responses.
  • To investigate the necessity of vestibular stimulation for these reflexes.
  • To analyze postural changes and compensatory reactions to taps.

Main Methods:

  • Subjects stood upright while being tapped on the forehead and chest with a reflex hammer.
  • Electromyography recorded leg muscle activity.
  • Postural sway was measured to quantify stability.

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Main Results:

  • Forehead taps consistently elicited leg muscle activity in normal subjects.
  • Similar reflexes were observed in subjects lacking vestibular function.
  • Muscle activation patterns counteracted tap-induced postural perturbations.
  • Chest taps produced comparable reflex responses.

Conclusions:

  • Vestibular input is not the sole prerequisite for tap-evoked leg reflexes.
  • Multisensory reflex pathways, integrating vestibular and proprioceptive inputs, likely mediate these responses.
  • These reflexes play a role in maintaining postural stability against external stimuli.