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There and back again: revisiting the on-time effect.

Alon Zivony1, Dominique Lamy1

  • 1School of Psychological Sciences, Tel Aviv University, Tel-Aviv, Israel.

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Summary
This summary is machine-generated.

Reducing stimulus exposure time in apparent motion illusions enhances perceived speed. This study explores the "on-time illusion" boundary conditions and mechanisms, finding it affects speed and time perception but not veridical motion.

Keywords:
Apparent motionMotion perceptionVelocity perceptionVisual illusion

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Area of Science:

  • Psychology
  • Neuroscience
  • Vision Science

Background:

  • Apparent motion creates a perception of movement from static images shown sequentially.
  • The
  • on-time illusion
  • where reduced stimulus exposure increases perceived velocity, was discovered but under-investigated.

Purpose of the Study:

  • To delineate the boundary conditions of the on-time illusion.
  • To clarify the underlying mechanisms of the on-time illusion.
  • To investigate the illusion's specificity and generalization.

Main Methods:

  • Five experiments using multi-item apparent-motion displays.
  • Participants judged perceived speed changes when on-time duration varied.
  • Tasks included speed perception and temporal bisection.

Main Results:

  • The on-time illusion was observed in both fast and slow apparent motion.
  • Stimulus luminance did not modulate the effect, ruling out energy-summation.
  • The illusion generalized to time perception and was specific to apparent motion, not veridical motion.

Conclusions:

  • The on-time illusion's boundary conditions were clarified.
  • Findings suggest mechanisms beyond simple energy summation.
  • The illusion's specificity to apparent motion provides insights into motion perception models.