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Perceived body position and the visual horizontal

F Mast1, T Jarchow

  • 1University of Zurich, Department of Psychology, Switzerland.

Brain Research Bulletin
|January 1, 1996
PubMed
Summary
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Human subjects perceive their body position differently from visual horizontal and vertical orientations. This study reveals distinct reference frames for proprioception and visual perception, impacting spatial orientation judgments.

Area of Science:

  • Neuroscience
  • Human Perception
  • Spatial Orientation

Background:

  • Understanding the relationship between perceived body position and visual orientation is crucial for spatial awareness.
  • Previous research has explored the subjective visual vertical and horizontal, but the interplay with perceived body position requires further investigation.

Purpose of the Study:

  • To investigate the relationship between subjective visual vertical, subjective visual horizontal, and perceived body position in healthy human subjects.
  • To determine if judgments of body position and visual object orientation rely on shared or distinct neural reference frames.

Main Methods:

  • Eleven healthy subjects were secured in a tiltable chair and rolled sideways to indicate their subjective horizontal body position.
  • In these positions, subjects adjusted a luminous line to be perceived as vertical and horizontal.

Related Experiment Videos

  • Data analysis focused on the alignment of perceived body position with the adjusted luminous line.

    • Main Results:

    • Subjective horizontal body position adjustments showed a broad range (mean 96.3°, SD 19.7°), indicating significant individual variability.
    • When in their subjective horizontal body position, the luminous line was not perceived as horizontal along the spinal axis; it was adjusted perpendicular to the subjective visual vertical (mean deviation 27.4°).
    • Individual accuracy in adjusting subjective horizontal body position varied widely (77.5° to 117.6°).

    Conclusions:

    • Judgments of one's own body position and the orientation of external objects relative to gravity are based on different reference frames.
    • The findings challenge previous investigations by highlighting the significant variability and distinct perceptual mechanisms involved in proprioceptive and visual orientation.