We must keep in mind that Marion stated, "You can't buy off unhappiness with pills." long before the advent of Prozac. (0:10)
Norman might have done better to practice what he preached: "There's no sense dwelling on our losses." (0:28)
Marion hears "Mother's" voice yelling at Norman (0:32).
Norman tells Marion, "She isn't quite herself today." Indeed, between Norman and his mother, it's hard to tell which self belongs to whom. (0:34)
Norman tells Marion, "A son is a poor substitute for a lover." (0:40)
Marion asks Norman, "Wouldn't it be better if you put her... someplace?" Norman replies, "You mean a mad house?" (0:40)
Norman continues, "It's not as if she were a maniac, a raving thing. She just goes a little mad sometimes." (0:42)
Norman watches Marion through a hole in her bathroom wall. (0:44)
Mother enters Marion's bathroom wielding a kitchen knife. (0:47)
Mother kills Arbogast on the stairs. (1:17)
Norman converses with Mother as he carries her down to the fruit cellar. (1:25)
In the fruit cellar Mother, whom we now know to be Norman, goes for Lila with the knife. (1:41)
Sheriff: "If anyone gets any answers, it'll be the psychiatrist." Dr. Fred Richmond says he got the history from Mother, that Norman no longer exists, that the other half has taken over. Psychiatrist Richmond says, a "psychiatrist merely tries to explain it... the mother half of Norman's mind... a clinging demanding woman... At times he could be both personalities... never all Norman... often only mother." (1:42)
An unidentified man suggests, "He's a transvestite." Dr Richmond counters, "Not exactly." He explains that would involve sexual motives not present here, that Norman cross-dressed to maintain the illusion that his mother still lives. (1:45)
We hear Mother's voice as Norman sits thinking. (1:47)
Why not diagnose Norman with Dissociative Identity Disorder?
All of which sets the stage for Psycho II.
Remade in 1998: Psycho