PROCEDURE 8 psychiatrists sent to 12 different mental hospitals 6 men, 2 women, one being Rossenhan who told the hospital director they were sending in people but all the other staff didn't know, said that they heard voices saying 'empty, thud, and hollow' they were diagnosed with schizophrenia one with manic depression, after admission they told the staff they were not experiencing symptoms and would like to leave acting normally again, did not lie about personal life except for their jobs, had to learn to fake swallow pills (some people did). Second part: Rossenhan said they were sending in more people later, hospital anticipated that fake patients would come in. 193 patients.