So what about dreams? According to Hobson's theories the brain synthesizes and interprets this internal activity that the brain is engaged in, and attempts to create meaning from these signals, which results in dreaming. The initial publication of this kind of research stirred up considerable controversy, particularly among Freudian analysts. In fact, Hobson is almost better known for the impact that his theories had on Freudian theory, than for the "soundness" of the actual theories he developed. Writing prompt: Why were these kinds of research and theories, like activation-synthesis, that focus on the more physiological "functions" of REM and dreams so problematic for Freud and psychoanalytic dream analysts? What aspects of Freudian theory are most challenged?