Abstract
The purpose of this paper is to describe the manner in which psycho-analytical concepts and theory may contribute to the difficult problem of diagnosis in schizophrenic reactions. At the present time there is an increasing realization that the criteria which are used in the diagnosis of these conditions are unsatisfactory, not only because they have a low prognostic significance but also because they fail to provide the research worker with discrete clinical concepts which he can use in physiological or psychological investigations. As Stengel (1960) has pointed out, the criteria employed in the diagnosis can vary extensively within the same hospital quite apart from the inevitable differences which exist within the one country and from country to country. It is the wide variation in what is called schizophrenia which has vitiated so much important and worthwhile research in clinical psychiatry.

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