The 1947 paper reported what Riccardo Steiner, in his entry on Rosenfeld in the International Dictionary of Psychoanalysis, calls the first adult psychotic case treated successfully by "a purely interpretative psychoanalytic method". It drew on Klein's newly published Notes on Some Schizoid Mechanisms4 and was the first clinical paper to use her concept of projective identification. Rosenfeld argued that the fragmentation of his patient's ego and the feelings of depersonalization arose from excessive splitting and from the projection of parts of the self into objects (Analysis of a Schizophrenic State with Depersonalization3).
Against the view that psychotic patients withdraw from objects and form no transference, Rosenfeld held that schizophrenic patients form an intense transference in which the analyst is treated as the bearer of the patient's projected parts. He called it the transference psychosis and set it apart from the transference neurosis: it is marked by the massive projection of unconscious phantasies onto the analyst and by primitive object relations. Its interpretation became the core of his technique (Psychotic States1).
In Notes on the Psychopathology of Confusional States in Chronic Schizophrenias5 (1950) he described states in which the normal, structuring split between good and bad objects, and between the loving and hating parts of the self, fails. Love and hatred become mixed, and the patient fears that the destructive impulses will destroy the good self and the good object. Where envy predominates, the good object itself is attacked, and good and bad can no longer be told apart. Rosenfeld treated confusion as poised between splitting and integration: it may be a step towards integration or a retreat from it. Klein took up his account of confusional states in Envy and Gratitude6 (1957).
Psychotic States collects papers in which Rosenfeld applied the theories and techniques Klein had developed with infants and young children to acute and chronic schizophrenia, severe hypochondriasis, drug addiction, severe depression and manic-depressive states. His aim was to test their therapeutic value and to see what they might show about the causes of psychosis. Besides the papers on depersonalization, confusion and narcissism, the book includes papers on male homosexuality and paranoia (1949), on the superego conflict and on transference phenomena in acute schizophrenic patients (1952), on drug addiction (1960), on the superego and the ego ideal (1962), on hypochondriasis (1964) and on acting out (1964). The Melanie Klein Trust describes the book as a strong case for the intelligibility of psychotic symptoms and for the benefit of treating them psychoanalytically.
A further paper of 1971, on the importance of projective identification in the ego structure and object relations of the psychotic patient, published in the collection Problems of Psychosis, sets out the different types and motives of projective identification; the Melanie Klein Trust calls it a standard reference. Rosenfeld came to distinguish projections that communicate a state of mind, which the analyst can contain, from projections that evacuate unwanted parts of the self or aim to control the object and deny separateness and dependence. Four chapters of Impasse and Interpretation2 take up the containment of projective identification in borderline and schizophrenic patients and the countertransference difficulties it creates.