Frances Tustin's classic text Autistic States in Children (1981) put forward convincing clinical evidence that some forms of childhood autism are psychogenic and respond to methods of treatment very different from the behavioural techniques often adopted without success. Her pioneering work with such children has gained ground since the book was first published and she herself has revised her understanding of the aetiology of psychogenic autism. This revised edition of the book incorporates her new thinking based on recent infant observational studies and her own clinical experience.