Early in Freud's career he changed his theory of what was responsible for neurotic behavior. What was his earlier view, what was his later view, and what evidence did he have for either?

What will be an ideal response?

At first he said problems arose from childhood sexual abuse. Later he said the problems originated from childhood sexual fantasies. He had no direct evidence for either view. He inferred sexual abuse, and later inferred sexual fantasies, from what his patients told him about their symptoms and dreams.