Which of the following was not a factor involved in the study conducted by psychologist david rosenhan? 1. eight individuals reported hearing voices that repeated several specific words. 2.the pseudopatients were treated and released from the hospital without a diagnosis. 3. all pseudopatients behaved normally and gave truthful answers regarding family history. 4. hospital staff did not distinguish healthy individuals from those who had a mental illness.

The correct answer is 2.The pseudopatients were treated and released from the hospital without a diagnosis. 

The Rosenhan experiment was a famous psychological experimental study conducted in the 1970s in the United States. The aim of this study was to investigate the validity of psychiatric diagnoses in psychiatric institutes. The participants in this study were pseudopatients (that means, they pretended to be patients suffering from mental disturbances when in fact they were actually healthy). The main finding of the this was that pseudopatients were misdiagnosed by psychiatric facilities as having a mental illness.