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

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Summary

Introduction

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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