In contrast, the combination of target motion and a dynamically changing context led to a robust size illusion, consistent with an interactive effect. Across five experiments examining 21 dynamic illusory configurations, adding target motion or a dynamically changing context separately resulted in little-to-no illusory effect. Here, we explore further dynamic versions of the Ebbinghaus illusion and the Corridor and Ponzo illusions by separately manipulating three types of dynamic elements: target motion, context translation, and dynamic changes in context. size constancy), the dynamic variants we tested in our previous work also differed in the nature of the dynamic elements specifically, whereas the Dynamic Ebbinghaus included a moving target and inducers that changed size and position, the Dynamic Corridor only included a moving target on a static background. ![]() Although these differences may arise from the different processes underlying these illusions (size contrast vs. Specifically, a dynamic version of the Ebbinghaus illusion (classically considered a “size contrast” illusion) led to a greatly enhanced illusory effect, whereas a dynamic version of the Corridor illusion (a “size constancy” illusion) led to a greatly diminished illusory effect. Recently, we demonstrated that illusion magnitudes of classic visual size illusions may be greatly enhanced or reduced by adding dynamic elements. Perceived size is a function of viewing distance, retinal images size, and various contextual cues such as linear perspective and the size and location of neighboring objects. 2Department of Psychology, University of Nevada, Reno, Reno, NV, United States.1Department of Psychology, College of the Holy Cross, Worcester, MA, United States.Mruczek 1*, Matthew Fanelli 1, Sean Kelly 1 and Gideon P.
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