Intellectual performance of chronic schizophrenic patients

Intellectual characteristics of 116 male chronic schizophrenic patients were investigated by using the Quick's test of intelligence. Indirectly, by this test the thinking of examinees was analysed. The examinees were divided into age-groups and differentially diagnostic groups. According to age, they were divided into three groups: from 25 to 40, from 41 to 50, and from 51 to 60 years. There were four differentially diagnostic groups: paranoid, catatonic, and hebephrenic patients and patients with schizophrenia simplex. The study has shown that the intelligence of chronic schizophrenic patients, divided into age groups, was significantly different. The average IQ of patients from 25 to 40 years was 82.9, from 41 to 50 years 67.4, and from 51 to 60 years 52.0. The intelligence of examinees divided into differentially-diagnostic groups was also significantly different. The average IQ of paranoid patients was 74.3, of catatonic patients 64.8, of hebephrenic patients 59.2, and of those with schizophrenia simplex 57.4. Most cases with IQ = 0 related to the group with schizophrenia simplex. The willing-instinctive personality sphere and perceptual disturbances in chronic schizophrenic patients appear to exert a significant influence on their intellectual characteristics.