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Interaction between Depth Order and Density Affects Vection and Postural Sway.

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Visual stimuli density and depth order significantly influence the sense of self-motion (vection) and postural sway. Background motion with higher density patterns amplifies these effects, suggesting shared neural control.

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Area of Science:

  • Perception and Cognitive Neuroscience
  • Human Factors and Ergonomics
  • Visual Perception

Background:

  • Vection (sense of self-motion) and postural sway are modulated by visual stimuli.
  • Depth order and pattern density are known visual factors influencing vection and sway.
  • The interaction between depth order and density in modulating vection and sway is not well understood.

Purpose of the Study:

  • To investigate how the interaction between visual stimulus depth order and pattern density affects vection and postural sway.
  • To determine if pattern density influences vection and sway differently when it is in the foreground versus the background.

Main Methods:

  • 17 participants were exposed to 18 stimuli with varying densities of stationary and rotating patterns.
  • Stimuli were manipulated so the rotating pattern was either in the foreground or background.
  • Vection was reported via button press; postural sway was measured using a force plate.

Main Results:

  • Both vection and postural sway increased when the rotating pattern was in the background and when its density was higher.
  • A significant interaction was found between perceived depth order and pattern density.
  • Background rotation with 60-80% density induced significantly more vection and sway than foreground rotation.

Conclusions:

  • The ratio of fore- to background pattern densities, not just the rotating pattern's density, is crucial for modulating vection and sway.
  • Similar modulation patterns for vection and postural sway suggest a common neural origin.
  • These findings advance understanding of visual perception's influence on balance and motion sense.