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Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with constant...
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Interaction between reference frames during subjective vertical estimates in a tilted immersive virtual environment.

Lionel Bringoux1, Christophe Bourdin, Jean-Claude Lepecq

  • 1Institut des Sciences du Mouvement "Etienne-Jules Marey", CNRS-Université de la Méditerranée, UMR 6233, 163 avenue de Luminy CP 910, F 13288 Marseille Cedex 9, France. lionel.bringoux@univmed.fr

Perception
|September 22, 2009
PubMed
Summary
This summary is machine-generated.

The rod-and-frame effect (RFE) in immersive virtual reality is influenced by visual scene complexity and control mode. RFE increases over time, especially with structured scenes and visuo-kinaesthetic control.

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Area of Science:

  • Perception science
  • Virtual reality
  • Spatial orientation

Background:

  • The rod-and-frame effect (RFE) demonstrates how visual context influences the perception of verticality.
  • Previous research established RFE using physical displays.

Purpose of the Study:

  • To investigate RFE in a CAVE-like virtual immersive environment.
  • To examine the impact of visual scene structure and control mode (visual vs. visuo-kinaesthetic) on RFE.
  • To explore the dynamic evolution of RFE during adjustment.

Main Methods:

  • Participants performed rod-and-frame adjustments in a CAVE-like environment.
  • Visual scenes varied in geometric and meaningful 3-D features.
  • Two control modes were used: visual (V) and visuo-kinaesthetic (VK).
  • Head restraint conditions (restrained vs. unrestrained) were compared.

Main Results:

  • RFE in the virtual environment was comparable to real-world settings.
  • More complex visual scenes and visual-only control led to greater RFE.
  • RFE significantly increased during the adjustment process.
  • The dynamic increase in RFE was more pronounced with structured scenes and VK control.

Conclusions:

  • Virtual immersive environments can effectively replicate the rod-and-frame effect.
  • Visual scene complexity and control modality significantly modulate RFE.
  • The perception of verticality dynamically adapts within immersive virtual environments.
  • Findings suggest a dynamic interplay between reference frames for spatial orientation.