ABSTRACT
Regarding clinical conditions characterized by psychic problems, we should note that at least four different orientations in different classification or evaluation systems of the patient have been identified. The four categories regarding schizophrenia are categorical, dimensional, structural, functional. In the categorical type of classificatory system, the different symptoms are gathered together in a specific illness entity that refers to an equal number of pathological conditions. World Health Organization studies carried out in many nations throughout the world have demonstrated that there are patients in every culture that exhibit symptoms typical of schizophrenia that last for less than six months. Among the categorical approaches to the diagnosis of schizophrenia, the system of classification of the psychotic condition proposed by Crow must be included. This system identifies two syndromes called positive schizophrenia (Type I) and negative schizophrenia (Type II). Patients diagnosed with negative schizophrenia have a high incidence of vague neurological symptoms.
