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(A) Illusory shift of flashed probes as a function of the frame’s speed (on a log scale). Path length was 10° and frame size 15°. (B) Illusory shift as a function of frame size. Path length was 5° and speed 30°/s. (C) Illusory shift as a function of path length for constant speed (30°/s) or constant motion duration (500 ms). Frame size is 15°. (D) Same as in C but for 141 participants run online. In all cases, error bars show ±1 SE when larger than the data symbols.
