Freud wrote a summary analysis of "Little Hans", in 1909, in a paper titled "Analysis of a Phobia in a Five-year-old Boy". The information gathered from the father included reports of Herbert's dreams, his behavior, and his answers to the father's questions. Freud believed that what he learned from Herbert's situation backed up his ideas about infantile sexuality as outlined in his Three Essays on the Theory of Sexuality in 1905. Herbert's fear was thought to be the result of several factors, including the birth of a little sister, his desire to replace his father as his mother's sexual mate, emotional conflicts over masturbation, and others. The anxiety was seen as stemming from the incomplete repression and other defense mechanisms being used to combat the impulses involved in his sexual development. Herbert's behavior and emotional state improved after he was provided with sexual information by his father, and the two became closer.