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  Schizophrenics see through hollow-mask illusion - health - 07 April 2009 - New Scientist

  Telling the front from the back of a mask can be more difficult than it seems. Thanks to an effect called the hollow-mask illusion, the brain can have trouble deciding if the image is convex or concave.

  But, it seems, not everyone struggles to correctly determine the mask's orientation. New research shows that people with schizophrenia are immune to the effect – a finding that means the illusion could provide a diagnostic test for the condition.

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