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The success may actually be linked to a weakness in a brain mechanism called contextual processing, which is responsible for picking out relevant sensory information from the barrage of stimuli a person constantly experiences.
Because vision depends on low-level contextual processing, the researchers, led by Steven Dakin of University College London, devised an experiment to test a person's ability to discriminate one contrasting pattern from another. A disc filled in with a medium-contrast pattern was placed in the center of a larger disc that had a high-contrast pattern. When placed one on top of the other, the difference in contrast appears negligible, when it is really 40 percent. The researchers hypothesized that schizophrenics would not judge the center disc in context of the larger one and therefore not recognize the visual distraction that creates the illusion. In fact, 12 out 15 schizophrenics more accurately judged the contrast of the center disc than did a group of 20 participants who do not suffer from the illness.
Originally posted by Umbrax
I also picked 3. I wonder why that one is most popular?