EPA / Explorer of Perception & Attention

Contrast-dependent Motion and Attentive Tracking Impairment in the Footsteps and Fan Illusions

Chien-Hui Chiu and Su-Ling Yeh


step illusion_demostrations for Experiment 1 and 2

Experiment 1: Effect of Contrast


Experiment 2: Effects of Surface Segregation and Deletion/Accretion Cues

Straddled Footsteps and Fan



Un-straddled Footsteps and Fan




Try out different combinations!

Manipulating Contrast, Straddle/Un-straddled Configurations 
and Depth in the Footsteps and Fan Illusions