Because of the many different symptoms associated with schizorphrenia some of these overlap into other mental disorders which could then lead to miss diagnosis, to counter this Schnieder (1959) identified First Rank Symptoms which were symptoms of schizophrenia found rarely in other disorders.
Rosenhan (1973) Sane in insane places:
He sent 8 sane people to different mental institues and told them to report ONE symptom of hearing a same sex single word such as "Thud" or "Empty". ALL of them got taken in as schizophrenics, as soon as they were in they stopped saying they had any symptoms and acted normal, however all behaviours they now did were disregarded as symptoms of the disorder. None of the pseudo patients were detected taking between 2 and 52 days for them all to be discharged.
Follow up study:
He told the hospitals he would do it again in the next 3 months, he didn't, he found 1 in 10 people who turned up were suspected and turned away.
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