Background: The most common approach in accepting abnormal behaviour is the medical model. This has used the DSM to classify the behaviour. David Rosenhan was a critic of this medical model.
The main experiment was a field design. Where the IV is the lack of symptoms and the DV the staff response. The first study involved 8 sane people (3 women and 5 men: a psychology student, 3 psychologists, a paediatrician, a psychiatrist, a painter and a housewife.)
The three words that the participants heard were "empty", "hollow" and "thud." The pseudo patients were also given a false identity for further protection.