A novel speed illusion involving expansion and rotation patterns

Vision Research
B J Geesaman, N Qian

Abstract

Using random dot stimuli well controlled for dot speed, we found that the moving features in expanding patterns appear to move faster than those in rotating patterns. The illusion is well correlated with the strength of the global motion signal. For example, in displays where the number of motion directions defining the patterns is reduced, the magnitude of the illusion decreases. Similarly, the strength of the effect diminishes as dot density is reduced. In patterns where only wedge-shaped segments of the stimuli are left exposed, the difference in perceived speed increases with the angular size of the wedge. Stimulus placement relative to the fixation point has little effect on the persistence of this phenomenon-expansion patterns appear to contain elements of greater speed, independent of stimulus eccentricity. These results argue against a local explanation for this perceptual illusion, suggesting that the global motion pattern of the stimulus, per se, is responsible.

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Citations

Nov 20, 2004·Experimental Brain Research·M R IbbotsonM J Mustari
May 5, 2006·Experimental Brain Research·Scott A Beardsley, Lucia M Vaina
Jul 2, 2008·Experimental Brain Research·Nobu ShiraiMasami K Yamaguchi
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May 12, 2009·Attention, Perception & Psychophysics·Peter J KohlerPeter Ulric Tse
Jan 23, 2014·Attention, Perception & Psychophysics·Peter Jes KohlerPeter Ulric Tse
Dec 4, 2009·Neuroreport·Antonio J Rodríguez-SanchezJulio C Martinez-Trujillo
Sep 12, 2015·IEEE Transactions on Visualization and Computer Graphics·Asmund BirkelandIvan Viola
Feb 13, 2001·Vision Research·N MatthewsN Qian
Jul 17, 1998·Vision Research·B J Geesaman, N Qian
May 1, 2012·Vision Research·Nobu Shirai, Shigeru Ichihara
May 27, 1999·Vision Research·C W CliffordL M Vaina
May 27, 1999·Vision Research·P J BexW Makous
Jul 11, 2006·Vision Research·Xin MengNing Qian
Apr 4, 2000·Vision Research·N MatthewsN Qian
Jan 13, 1998·Vision Research·P J Bex, W Makous
Apr 8, 2006·Vision Research·Mark Edwards, Leslie Grainger
Apr 28, 2007·Vision Research·Craig Aaen-StockdaleRobert F Hess
Oct 9, 2002·Vision Research·José F Barraza, Norberto M Grzywacz
Jun 5, 2004·Perception·Clifford F Lewis, Michael K McBeath
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Apr 5, 2008·Cognitive Science·Mark A ChangiziShinsuke Shimojo

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