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Christopher Blair, Gennady Erlikhman, Gideon Caplovitz; The Wandering Circles: A flicker-rate and contour dependent motion illusion. Journal of Vision 2019;19(8):105. doi: https://doi.org/10.1167/19.8.105.
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© ARVO (1962-2015); The Authors (2016-present)
Here we present an original illusion in which polarity reversing, stationary Craik-O’Brien-Cornsweet stimuli viewed under maintained fixation appear to move with dramatic unpredictable trajectories The global motion largely arises from the distribution of local motion signals that are generated along the polarity-reversing contour For example, a polarity reversing Cornsweet line may appear to move in either of the directions orthogonal to its contour. Whereas a pattern reversing circle, which has local motion pointing in all directions, may appear to wander aimlessly across the screen and deform in any number of ways These effects appear to be strongest when stimuli are viewed peripherally, and polarity reversals occur at a rate 8–12 Hz These effects are greatly reduced for non-Cornsweet stimuli, such as a light and dark line side by side, or a unipolar Gaussian contour.
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