Classification of anomalous motion illusions
This classification is not completed or is not the accepted one. This is only my tentative proposal
since August 30, 2004 updated September 7, 2006
Type | Characteristics | Direction of illusory motion | Source of illusion | Examples | Notes |
I | A smooth retinal slip generates this type | Perpendicular to the retinal slip | Misintegration of motion signals? | Ouchi illusion, Pinna-Brelstaff illusion, and others | |
II | A smooth retinal slip generates this type, where low-contrast regions appear to move | The same direction as the retinal slip | Visual latency? | Kitaoka and Ashida, ECVP2002 Glasgow"An anomalous motion illusion based upon signal delay" (cf. fluttering heart) |
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III | A smooth retinal slip generates this type, where low-spatial-frequency parts appear to move | The same direction as the retinal slip | Difference in apparent speed? | Kitaoka and Ashida, forthcoming | |
IV | Chromatic edges appear to move | ? | Dynamic changes in chromatic abberation? | Kitaoka, Kuriki and Ashida, under study (cf. fluttering heart) |
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V | Staircase-shape edges appear to move | ? | ? | Kitaoka (2002) Trick Eyes. Tokyo: Kanzen | |
VI | "Heat shimmer" appears | ? | ? | Kitaoka (2002) Trick Eyes. Tokyo: Kanzen | |
VII | An illusory "hop" appears | ? | ? | Kitaoka (2002) Trick Eyes. Tokyo: Kanzen | |
VIII | Parts appear to move in a constant direction | Constant | Luminance profile or luminance gradient | Optimized Fraser-Wilcox illusion Kitaoka and Ashida (2003a) |
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IX | Parts appear to move in a constant direction | Constant | Luminance gradient | "Central" drift illusion Kitaoka and Ashida (2003b) |
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X | Parts appear to move in either of the two directions | Bistable | Blink-dependent apparent movement? | Blink-dependent rotation cf. Faubert and Herbert's (1999) peripheral drift illusion (this should be an independent category) |
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XI | Parts appear to move in a constant direction | Constant | Cross of lines | under study |
There are some images that cannot be classified into any of these categories.