The Vanishing Coin Illusion: When sound congruence affects visual representation of motion.

In the "classic" vanishing ball illusion (VBI), a magician pretends to throw a ball and the audience sees it go up and then disappear. To gain a better understanding of the mechanisms involved, we conducted two experiments to analyze the permeability of this type of illusion to auditory information. A modified version of the VBI (i.e., the Vanishing Coin Illusion [VCI]), was presented, and this was either accompanied by a sound or was not. The results show that the presence of a sound adds to the success of the illusion (Experiment 1), especially when this sound is congruent with the illusion (Experiment 2). Based on these results, we discuss the mechanisms at work in this illusion.