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The A-Effect and Global Motion.

Pearl S Guterman1, Robert S Allison1

  • 1Centre for Vision Research, York University, Toronto, ON M3J 1P3, Canada.

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|November 19, 2019
PubMed
Summary
This summary is machine-generated.

Body tilt alters vertical perception, affecting static lines and motion displays. The A-effect, or perceived tilt bias, was stronger for static lines than motion, and greater for self-motion than object-motion.

Keywords:
A-effectgravitymotionmotion parallaxorientationself-motionsubjective visual verticaltiltvectionvision

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Area of Science:

  • Neuroscience
  • Perception Science
  • Human Factors

Background:

  • The perception of verticality is influenced by body orientation.
  • The A-effect describes the perceived tilt of a static line when the body is tilted.
  • It is unclear how the A-effect applies to global motion perception, especially distinguishing between object-motion and self-motion.

Purpose of the Study:

  • To investigate if the A-effect extends to global motion perception.
  • To compare the A-effect for static lines, 2D planar motion, and 3D volumetric motion.
  • To differentiate the A-effect between object-motion and self-motion perception.

Main Methods:

  • Participants stood or lay tilted while viewing static lines or random-dot displays of 2D/3D motion.
  • They reported perceived verticality or motion direction relative to gravitational vertical.
  • Psychometric functions were used to measure shifts in the point of subjective verticality (PSV).

Main Results:

  • Body tilt induced an A-effect for both static lines and optic flow, biasing perception towards the body tilt.
  • The A-effect was significantly larger for static lines than for volumetric motion, and larger for volumetric than planar motion.
  • The A-effect was more pronounced in self-motion conditions compared to object-motion conditions, with more precise discrimination in self-motion.

Conclusions:

  • The A-effect influences the perception of both static and dynamic visual stimuli during body tilt.
  • Differences in the magnitude of the A-effect suggest distinct processing of visual-vestibular information for static lines versus motion, and for self- versus object-motion.
  • Vection, experienced during visual-vestibular conflict, may contribute to the observed differences in self-motion perception.