The Dynamic Ebbinghaus: motion dynamics greatly enhance the classic contextual size illusion

Frontiers in Human Neuroscience
Ryan E B MruczekGideon P Caplovitz

Abstract

The Ebbinghaus illusion is a classic example of the influence of a contextual surround on the perceived size of an object. Here, we introduce a novel variant of this illusion called the Dynamic Ebbinghaus illusion in which the size and eccentricity of the surrounding inducers modulates dynamically over time. Under these conditions, the size of the central circle is perceived to change in opposition with the size of the inducers. Interestingly, this illusory effect is relatively weak when participants are fixating a stationary central target, less than half the magnitude of the classic static illusion. However, when the entire stimulus translates in space requiring a smooth pursuit eye movement to track the target, the illusory effect is greatly enhanced, almost twice the magnitude of the classic static illusion. A variety of manipulations including target motion, peripheral viewing, and smooth pursuit eye movements all lead to dramatic illusory effects, with the largest effect nearly four times the strength of the classic static illusion. We interpret these results in light of the fact that motion-related manipulations lead to uncertainty in the image size representation of the target, specifically due to added noise at the lev...Continue Reading

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Citations

Jan 4, 2020·Attention, Perception & Psychophysics·Ryan E B MruczekGideon P Caplovitz
Feb 16, 2020·Psychological Research·François MaquestiauxMarie Mazerolle

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