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Postural adjustment as a function of scene orientation.

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  • 1Department of Psychology, Graduate School of Letters, Kyoto University, Kyoto, Japan.

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This study reveals how visual cues like scene orientation influence our sense of balance. Different visual elements contribute uniquely to postural control and the subjective visual vertical, impacting how we perceive upright orientation.

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Area of Science:

  • Neuroscience
  • Biomechanics
  • Human Perception

Background:

  • Postural control relies heavily on visual orientation cues.
  • The precise contribution of different visual cues to postural responses remains unclear.

Purpose of the Study:

  • To investigate the relationship between postural response and subjective visual vertical (SVV) under varying scene orientations.
  • To quantify the contribution of visual cues (frame, horizon, polarity) to head tilt and SVV error.

Main Methods:

  • Participants viewed a virtual room with objects via a head-mounted display, with room orientation systematically varied.
  • Head tilt was measured, and subjective visual vertical was assessed using a rod adjustment task.
  • A weighted vector sum model analyzed the contribution of visual cues to head tilt and SVV error.

Main Results:

  • All tested visual cues (frame, horizon, polarity) significantly contributed to both head tilt and SVV error.
  • Frame cues had the largest impact on SVV error, while polarity had the smallest.
  • Contributions of visual cues to head tilt were less distinct but followed a similar pattern to SVV error.

Conclusions:

  • Multiple visual cues are integrated for effective postural control.
  • Perception of verticality (SVV) and its use in postural control may involve distinct neural representations of visual orientation information.