Quick-time videos of various SFM objects

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Forced ambiguous switch

In forced ambiguous switch paradigm, physical motion of dots in inversed at a predefined time instant Treversal. This creates a situation of an "ambiguous event". 
Illusory may reverse (top outcome), following inversion of physical dots;
or it may remain constant (bottom outcome).





Reducing number of dots in structure-from-motion, increasing pairing distance, decreasing rotation speed or adding color all facilitates reversals of illusory rotation. However, try using a small pairing distance with added color: you'll notice that dots "seemlessly" change their color as illusory rotation remains constant.