The background grating appears to flow in the opposite direction of the walking gait, just like optic flow of a striped wall during tracking a walker with eyes.
Actually, the grating is directionally ambiguous.
(Hide the lady with your finger)
This backscroll illusion indicates that the visual system evaluates retinal motion signals in relation to higher representation of object motion defined by biological motion.
Fujimoto, K., Yagi, A. and Sato, T. (2009). Strength and variability of the backscroll illusion. Vision Research, 49, 760-765.
Fujimoto, K. and Yagi, A. (2008). Biological motion alters coherent motion perception. Perception, 37, 1783-1789.
Fujimoto, K. and Yagi, A. (2007). Backscroll illusion in far peripheral vision. Journal of Vision, 7(8):16, 1-7.
Fujimoto, K. & Sato, T. (2006). Backscroll illusion: Apparent motion in the background of locomotive objects. Vision Research, 46, 14-25.
Fujimoto, K. (2003) Motion induction from biological motion. Perception, 32, 1273-1277.
Finalist of the illusion contest by ECVP 2005 [link]
Best presentation of KanPsy 2004 (114th annual meeting of Kansai Psychological Association)
Excellent presentation of JPS 2003 (21st annual meeting of Japanese Psychonomic Society)
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