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Related Experiment Videos

Somatic graviception

H Mittelstaedt1

  • 1Max-Planck-Institut für Verhaltensphysiologie, Seewiesen, Germany.

Biological Psychology
|January 5, 1996
PubMed
Summary
This summary is machine-generated.

New research reveals previously unknown graviceptors in the human trunk significantly influence posture perception. These receptors, located near the last ribs, provide crucial gravity information via two distinct neural pathways.

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Area of Science:

  • Neuroscience
  • Human Physiology
  • Sensory Perception

Background:

  • Posture perception is significantly influenced by sensory input.
  • The role of specific graviceptors in the human trunk remains largely uncharacterized.

Purpose of the Study:

  • To identify and localize novel graviceptors in the human trunk.
  • To elucidate the neural pathways mediating somatic graviception.
  • To investigate the influence of internal organs on gravity perception.

Main Methods:

  • Psychophysical experiments using a rotating centrifuge to assess perceived horizontal orientation.
  • Evaluation of paraplegic patients with varying levels of spinal cord injury.
  • Assessment of the effects of bilateral nephrectomy and lower body positive pressure on graviception.

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Main Results:

  • Normal subjects and neuromectomized subjects localized graviceptors differently, suggesting mass distribution is key.
  • Somatic graviception involves at least two distinct neural inputs, one entering at the 11th thoracic segment and another cranial to the 6th cervical segment.
  • The input entering at the 11th thoracic segment is influenced by the kidneys, while the cranial input appears to rely on the inertia of body mass, potentially blood in large vessels.

Conclusions:

  • The human trunk contains previously unknown graviceptors crucial for posture.
  • Somatic gravity perception is mediated by at least two distinct neural pathways with different localizations and dependencies.
  • Kidneys and the inertia of blood mass are implicated in gravity perception, suggesting complex physiological mechanisms.