rather than brain structure. Freud was also an early researcher in the field of cerebral palsy, which was then known as "cerebral paralysis". He published several medical papers on the topic and showed that the disease existed long before other researchers of the period began to notice and study it. He also suggested that William John Little, the man who first identified cerebral palsy, was wrong about lack of oxygen during birth being a cause. Instead, he suggested that complications in birth were only a symptom. The origin of Freud's early work with psychoanalysis can be linked to Josef Breuer. Freud credited Breuer with opening the way to the discovery of the psychoanalytical method by his treatment of the case of Anna O. In November 1880, Breuer was called in to treat a highly intelligent 21-year-old woman (Bertha Pappenheim) for a persistent cough and hallucinations that he diagnosed as hysterical. He found that while nursing her dying father, she had developed some transitory symptoms, including visual disorders and paralysis and contractures of limbs, which he also diagnosed as hysterical. Breuer began to see his patient almost every day as the symptoms increased and became more persistent, and observed that she entered states of absence. He found that when, with his encouragement, she told fantasy stories in her evening states of absence her condition improved, and most of her symptoms had disappeared by April 1881. Following the death of her father in that month her condition deteriorated again. Breuer recorded that some of the symptoms eventually remitted spontaneously and that full recovery was achieved by inducing her to recall events that had precipitated the occurrence of a specific symptom. In the years immediately following Breuer's treatment, Anna O. spent three short periods in sanatoria with the diagnosis "hysteria" with "somatic symptoms", and some authors have challenged Breuer's published account of a cure. Richard Skues rejects this interpretation, which he sees as stemming from both Freudian and anti-psychoanalytical revisionism — revisionism that regards both Breuer's narrative of the case as unreliable and his treatment of Anna O. as a failure. Seduction theory In the early 1890s, Freud used a form of treatment based on the one that Breuer had described to him, modified by what he called his "pressure technique" and his newly developed analytic technique of interpretation and reconstruction. According to Freud's later accounts of this period, as a result of