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Area of Science:

  • Human-Computer Interaction
  • Virtual Reality
  • Perceptual Psychology

Background:

  • Perceived eye height influences object size perception in real and virtual environments.
  • Conflicts between real and simulated eye height in VR can alter user experience.

Purpose of the Study:

  • To investigate how real-life posture affects size perception in VR.
  • To test the hypothesis that clear real-world eye height expectations amplify VR simulation effects.

Main Methods:

  • 40 participants compared virtual object size against a physical object in VR.
  • Tasks were performed across four real-life postures (supine, sitting, standing, standing on table) and varied simulated eye heights.
  • Perceived size of a virtual square was assessed against a physical stick.

Main Results:

  • Perceived object size varied inversely with simulated eye height, confirming prior research.
  • Simulated eye height variations had a significantly greater impact on size perception in the sitting posture.
  • The effect of simulated eye height was not significantly less in the supine position compared to standing.

Conclusions:

  • Real-life posture demonstrably influences visual size perception within virtual reality environments.
  • The hypothesis regarding reliable ground plane estimates was not fully supported, indicating complex interactions.
  • Findings highlight the importance of considering user posture for accurate VR experiences.