Representation in Psycho

In the opening scene of Psycho, an Alfred Hitchcock film, we see two people on a bed together. The woman is made to look innocent as she the underwear that she is wearing is all white, she also has blonde hair, Hitchcock believed that women with blonde hair looked virginal. The audiences perception of her changes however, after we hear her talking to the man about his wife and how she does not like being secretive and meeting up with him in her lunch breaks.
When the woman is driving through the rain in the dark, there is creepy music which builds up the tension and all these factors are very ominous making the audience think something bad is going to happen. However when she arrives at the Bates Motel the music has stopped but we then see an old, scary looking house in the distance with one light on, creating suspition in the audience. This all changes when she is greeted by a pleasant man who is polite to her and helps her with her bags, however the suspition is once again aroused when he hesitates over which room to give her. Later on we see him looking though a small hole in the wall, by now the audience know that this man is the protagonist and expect something to happen.
Fourty-Five minutes into the film, this woman is murdered, we only see the sillouhette of the killer but it looks like an old woman, as we see her hair and the style of her clothing and assume it is the mans mother. Our suspition is confirmed when we see the man come into the room and look shocked to see her dead on the floor and think he is trying to protect his mother by clearing away any evidence and removing the body. However at the end of the film, we find out that it was not his mother that killed her as she is already dead and he has been keeping her in the basement, but in fact he dresses up to look like her and kills the woman.