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Subjective posture in tridimensional space.

I Israël1, I Giannopulu

  • 1Chart - EPHE, Paris, France. isabelle.israel@free.fr

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Summary
This summary is machine-generated.

Body orientation differs between pitch and roll axes. Humans struggle to accurately orient to the vertical on the roll axis, unlike the pitch axis, due to distinct internal body representations.

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Area of Science:

  • Neuroscience
  • Human Physiology
  • Biomechanics

Background:

  • The internal body representation is crucial for postural orientation relative to earth-vertical.
  • Postural orientation has default forward tilt on the pitch (Y) axis but not the roll (X) axis.

Purpose of the Study:

  • To investigate differences in the internal representation of body position between the Y and X axes.
  • To assess whole-body orientation accuracy to horizontal and vertical planes on the X (roll) and Y (pitch) axes in darkness.

Main Methods:

  • Healthy seated subjects performed self-driven whole-body orientation tasks in complete darkness.
  • Orientation accuracy was measured for movements towards the horizontal and vertical on both the X (roll) and Y (pitch) axes.

Main Results:

  • On the X-axis (roll), subjects maintained their initial tilt direction and avoided crossing the vertical midline when returning.
  • On the Y-axis (pitch), subjects undershot the horizontal when moving supine and overshot when moving prone.
  • Discrepancies in Y-axis orientation may stem from somatosensory cues in a seated posture.

Conclusions:

  • The internal representation of body position and its orientation mechanisms differ significantly between the roll (X) and pitch (Y) axes.
  • Somatosensory feedback likely influences body orientation accuracy, particularly on the pitch axis.
  • Further research into the neural underpinnings of the head-foot line construction and graviceptive systems is warranted.