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It’s plausible to suppose that the greater the velocity of a body, the greater effect it could have on other bodies. This does not depend on the direction of the velocity, only its magnitude. At the end of the seventeenth century, a quantity was introduced into mechanics to explain collisions between two perfectly elastic bodies, in which one body makes a head-on collision with an identical body at rest. When they collide, the first body stops, and the second body moves off with the...
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The kinetic Orbison illusion.

Hikari Matsunaga1, Hiroyuki Ito2,3, Tama Kanematsu2,3

  • 1Graduate School of Design, Kyushu University, Fukuoka, Japan.

I-Perception
|September 25, 2023
PubMed
Summary
This summary is machine-generated.

The kinetic Orbison illusion causes perceived bending in square trajectories, stronger than the static version. This visual illusion is likely due to induced motion from background circles, not motion streaks.

Keywords:
Orbison illusionaperture problemgeometrical illusioninduced motionmotion streaks

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Area of Science:

  • Visual perception
  • Psychophysics
  • Optical illusions

Background:

  • The static Orbison illusion demonstrates illusory bending of straight lines on concentric circles.
  • A motion-based variant, the kinetic Orbison illusion, is explored here.

Purpose of the Study:

  • To investigate and quantify the kinetic Orbison illusion.
  • To determine the underlying mechanisms of this motion-induced visual distortion.

Main Methods:

  • Participants adjusted a comparison stimulus to match the perceived shape of a moving square trajectory.
  • The amount of illusory bending was measured as the discrepancy between the actual and adjusted shapes.
  • Fixation and pursuit conditions were compared to isolate the cause of the illusion.

Main Results:

  • The kinetic Orbison illusion exhibited greater illusory bending (over twice the static effect) than the static Orbison illusion.
  • Maximum perceived bending reached 7.3% of the trajectory's side length.
  • The illusion was not caused by motion streaks but likely by induced motion from background circles.

Conclusions:

  • The kinetic Orbison illusion is a robust phenomenon significantly stronger than its static counterpart.
  • Induced motion, potentially influenced by the aperture problem, is proposed as the primary mechanism.
  • Further research into motion perception and contextual influences on visual processing is warranted.