Abstract
When a striped disk moves across a flickering background, the stripes paradoxically seem to move faster than the disk itself. We attribute this new illusion to reverse-phi motion, which slows down the disk rim but does not affect the stripes.
Highlights
Experiments on human motion perception have often used moving patterns that are viewed through a window
Anstis (1989) and De Valois and De Valois (1991) demonstrated a so-called “motion-induced position shift,” where perceived window position was biased toward the direction of motion within
Observers either tracked the moving patch or fixated a stationary point at ~6° eccentricity. They adjusted the speed of the grating using designated keys until it appeared to move at the same speed as the window
Summary
Experiments on human motion perception have often used moving patterns that are viewed through a window. We introduce a converse illusion, in which the window motion clearly affects the pattern within (Figure 1). On a flickering background, the grating appears to move noticeably faster than the window, apparently drifting to the right within a slower moving window (Figure 1b).
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