5 men and 3 women pseudo patients used fake identities and fake histories got into 12 psychiatric hospitals.
They said to the staff that they had been ehearing voces which were unclear, unfamiliar that said "empty", "hollow", and "thud".
once the were admitted into the hospital they said they were fine and no longer had the symptoms.
They observed the staff and real patients and recorded what they saw, and their aim was to persuade the staff that they were fine and could leave the hospital.
In four of the hospitals, pseudo patients approached members of staff and asked, “Pardon me Mr/Dr/Mrs X, could you tell me when I will be eligible for grounds privileges / ....when will I be presented at the staff meeting / ...when am I likely to be discharged?”
Pseudo patients observed the responses and recorded them in their notebooks.
The aim of the study was to test the hypothesis that psychiatrists cannot reliably tell the different between people who are sane and those who are insane.