As well as his pressure technique, Freud's clinical procedures involved analytic inference and the symbolic interpretation of symptoms to trace back to memories of infantile sexual abuse. His claim of one hundred percent confirmation of his theory only served to reinforce previously expressed reservations from his colleagues about the validity of findings obtained through his suggestive techniques. Freud subsequently showed inconsistency as to whether his seduction theory was still compatible with his later findings. In an addendum to "The Aetiology of Hysteria" he stated: "All this is true sexual abuse of children; but it must be remembered that at the time I wrote it I had not yet freed myself from my overvaluation of reality and my low valuation of phantasy". Some years later Freud explicitly rejected the claim of his colleague Ferenczi that his patients' reports of sexual molestation were actual memories instead of fantasies, and he tried to dissuade Ferenczi from making his views public. Karin Ahbel-Rappe concludes in her study "'I no longer believe': did Freud abandon the seduction theory?": "Freud marked out and started down a trail of investigation into the nature of the experience of infantile incest and its impact on the human psyche, and then abandoned this direction for the most part."