How Magic Tricks Work and the Fuzzy Amodal Completion
Please read Ekroll et al. (2017), "The other side of magic: The psychology of perceiving hidden things".
This article explores how different sorts of magic tricks work, while also taking the reader on a fun romp through many understudied phenomena of "amodal completion". Please answer the following questions:
(1) What shapes, when partly covered, are expected to generate relatively "fuzzy" amodal completion? What shapes, when partly covered, are expected to generate relatively less fuzzy amodal completion? Can you think of a method that an experimenter could use to measure the fuzziness/precision of an observer's amodal percepts?
(2) According to the authors, what sorts of magic tricks can be repeated again and again without losing their effectiveness? And what sorts of magic tricks should a magician perform just once per show? Why?
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1 What shapes, when partly covered, are expected to generate relatively “fuzzy” amodal completion? Can you think of a method that an experimenter could use to measure the fuzziness/precision of an observer’s amodal percepts?
Amodal perception is essential in creating powerful magic through cognitively impenetrable perceptual mechanisms. When specific shapes are partially covered, they produce a relatively fuzzy amodal completion, and these are the triangle, square, and circle shapes (Ekroll et al., 2017).
An experimenter may be able to measure the fuzziness or precision of an observer’s amodal percepts using a method that employs multiple observers. The experiment needs five to ten observers. Then, the experimenter must prepare real-world objects that stimulate the observers’ amodal perceptions. The experimenter may also carry out two sets of experiments. In the first experiment, the observers may look at the objects simultaneously. However, the observers may examine the objects individually for the next experiment. Through the experiments, the...
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