A diagnostic test for hysteria?
Early in the movie, the nurse is told that Mrs. Vogler has been given every conceivable test, and it is clear that there is nothing wrong with her mentally or physically, that it is not an hysterical reaction. My goodness! I didn't know there was a diagnostic test that could rule out hysteria. Did her blood work come back negative for a psychosomatic condition? I wonder how a psychiatrist could rule out psychosis in a patient who refuses to answer any questions?
So what is the point of asserting the existence of tests that can absolutely rule out such mental aberrations, when we all know that even today there are no such tests? Why, to force us to conclude that her condition is existential and thus a worthy subject for treatment in another weird film by Bergman.
It doesn't get any more artificial than this.