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New illusions of sliding motion in depth

Pinna, Baingio and Spillmann, Lothar (2005) New illusions of sliding motion in depth. Perception, Vol. 34 (12), p. 1441-1458. eISSN 1468-4233. Article.

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DOI: 10.1068/p3476


Apparent sliding motion in the so-called Ouchi illusion has been attributed to the global integration of local motion vectors arising from the aperture effect (Fermüller et al, 2000 Vision Research 40 77 – 96; Mather, 2000 Perception 29 721 – 727). In a number of variants of the Ouchi illusion, we here demonstrate that sliding motion will also arise without a directional motion bias from local elements. Specifically, we show that in a disk – annulus pattern made from wiggly lines, sliding motion occurs although the local orientations within the disk and annulus are the same. We then argue that in an array of square-shaped checks, sliding motion originates from the interaction between the explicit orientation of the checks and the implicit orientation of the invisible diagonals. Finally, we demonstrate that a central array of filled black circles surrounded by a grey edge appears to slide relative to a surround of empty circles. We tentatively account for sliding motion in this figure by differences in speed signals, figure – ground segregation and apparent depth due to contrast polarity, edge blur, demarcation by a frame, and difference in shape.

Item Type:Article
ID Code:2394
Uncontrolled Keywords:Sliding motion, Ouchi illusion, circles
Subjects:Area 11 - Scienze storiche, filosofiche, pedagogiche e psicologiche > M-PSI/01 Psicologia generale
Divisions:001 Università di Sassari > 01 Dipartimenti > Scienze dei linguaggi
Deposited On:18 Aug 2009 10:07

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