<br />What does it mean to be sane? How reliably can even medical professionals distinguish the sane from the insane?<br /><br />Psychologist Dr. David Rosenhan of Stanford University had long been interested in these age-old questions and, in 1969, devised a unique experiment to put them to the test.<br /><br />Rosenhan and seven other perfectly sane subjects went undercover inside various psychiatric hospitals from 1969-1972 and acted insanely in order to see if the doctors there could tell that they were faking. The doctors could not.
