What is the author's style in The Interpretation of Dreams by Sigmund Freud?

Freud made a bold move in choosing to write The Interpretation of Dreams, a "scientific" treatise, in the first person narrative voice—meaning that he inserts himself into the text as an individual, using the pronoun "I." Freud's theoretical insights, which he puts forth in The Interpretation of Dreams, are a direct result of several years of intensive self-analysis; thus, he analyses his own dreams as examples to prove his theory of dream interpretation.