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Area of Science:

  • Neuroscience
  • Perception Psychology
  • Human Factors

Background:

  • Visual self-motion perception, or vection, is traditionally thought to require motion defined by luminance changes.
  • The role of other visual features in inducing vection remains less understood.

Purpose of the Study:

  • To investigate if visual motion defined by features other than luminance can induce vection.
  • To examine the specific effect of orientation-defined rotation (fractal rotation) on perceived self-rotation (roll vection).

Main Methods:

  • Conducted psychophysical experiments using orientation-defined fractal rotation as a visual stimulus.
  • Compared vection induced by orientation-defined rotation with that induced by luminance-defined rotation.
  • Investigated combined effects of simultaneous orientation- and luminance-defined rotations.

Main Results:

  • Orientation-defined visual rotation was found to strongly induce perceived self-rotation (roll vection).
  • The vection induced by orientation-defined rotation was significantly weaker than that induced by luminance-defined rotation.
  • When combined, luminance-defined rotation predominantly determined perceived self-rotation, regardless of direction consistency.

Conclusions:

  • Visual motion defined by orientation, without luminance modulation, can contribute to self-motion perception.
  • Luminance-defined motion appears to be a dominant factor when presented concurrently with orientation-defined motion.