Most psychological movies i seen starts with a crime scene and lets the viewer with suspense. The movie gave me quiet a surprise in getting Janet Leigh killed as i felt like she would be the one living through the entire movie in the start. Secondly i really believed Anthony Perkins mother to be still alive. The psychological influences of the characters in the movie showed the darker and tragic sides of the character. There are many similar kind of movie adaptations.
For example the movie vacancy(2007) shows the same style of a motel which is deserted and having a very sinister approach.
A young married couple becomes stranded at an isolated motel and finds hidden video cameras in their room. They realize that unless they escape, they'll be the next victims. But what i felt missing in this movie was that there was mot much psychological pressure but just plain nightmare similar to House of wax(2005).
The movie Halloween(1978) and Scream(1996) gives a good example of psychological impact on the story play as well as nightmare.