He used the word representation (Vorstellung) to signify the mental idea or image of any object that is experienced as being external to the mind. It is sometimes translated as idea or presentation. This concept includes the representation of the observing subject's own body. Schopenhauer called the subject's own body the immediate object because it is in the closest proximity to the mind, which is located in the brain.
Read more about this topic: The World As Will And Representation