'Das Experiment'

By RICHARD MORGAN

What it is: A German film about a two-week psychological experiment that goes awry. Test subjects assigned to play guards mutiny and then torture subjects assigned to play prisoners; one prisoner is murdered, and a researcher is raped. The movie is very loosely based on a notorious experiment conducted in 1971 at Stanford University.

Our expert: Edward F. Diener, a psychology professor at the University of Illinois at Urbana-Champaign. Mr. Diener has done extensive research on