Face/off vase/off, classifying a subject's interpretation of a bistable image using EEG

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The drawings in Figure 1 look normal on first sight. They look like a vase, a rabbit or a young lady. But after a few seconds you see something different: two faces facing each other, a duck and an old lady. Just as sudden as this interpretation switches, it switches back again. These images have fascinated many people. They are a staple in popular books on optical illusions, and there are many classic examples of images, like the rabbitduck illusion, dating back to the late 19th century [1], [2]. The technical term for these are ’bistable images’. Bistable images are images that have two (hence the ’bi’) stable ’interpretations’, where only one of these interpretations can be seen at a time. Which one you see changes over time, seemingly at random. Bistable images are only a subset of a class of illusions called multistable perception. There are images with three or more stable interpretations (the ’multistability’ in multistable perception). Plus, multistability has been identified not only in visual perception but in hearing and smell as well. Bistable images, however, are the most common, known and researched.
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