Research on title sequences

what is the purpose of title sequences, how do we read the title sequences, what are the codes and conventions of title sequences, well one thing i know for sure is that a title sequence should not be confused with a opening credits, they are both very different things that can easily be mistaken for each other. opening credits are at the beginning of a film/program were the cast members are just shown through text, where as the opening sequence is more detailed and presents their film/program. Using codes and conventions the opening sequence sets a theme of how the film a will react with us, and how hte genre is set, an example of this is simply that if the film would be a horror/thriller, there will be clues with in the title sequence, for instants the the music will respond with the theme of the film, dark and mysterious or loud and extreme, maybe even hyper and screamish. the lighting will also create an emotion for the target audience, there may be shadows that are casted. also in the title sequences it is important to have pinches of clues in different places, what is also important in the making of opening sequences is that the setting of the opening sequence is key, for example if the film is about death in a haunted house the best place to set the opening sequence would be either in the house or related to the haunted house.
so the idea of the title sequences are very important as they follow out the film, you cant just go straight into a film with out knowing the production team and actors, an opening sequence is important to the media, know one knows what is going to happen no one knows the strength of the film, until the credits appear, you cant just go straight into the film, just like you can go straight into a meal, you have to have the starters first, just to sweeten yourslef up, in this case to set your emotions to what the film is going to be like.