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The McGurk Illusion
It's hard to know exactly where the boundaries of illusions and other kinds of inference lie. These kind of optical and auditory illusions almost seem fun and benign, but presumably we can take the basic picture that there's an enormous amount of information coming into our senses at every moment. We filter it to fit our perceptions and then correct for the errors. That must also work with abstract concepts or news items just as much as pictures that we get through our eyes. It does seem as if we're using internal information to help make the predictions that structure our experience of the external world.