[Latencies of Sensory and Cognitive Components of Event Related Potentials during Perception of Verbal Stimuli in the Norm and Schizophrenic Patients].

The aim of this work is the study of early and later indices of brain informational processing during the passive reading of concrete words in healthy subjects and schizophrenic patients using the ERP method. Comparative analysis of components P100, N170, P200 and P300 in implicit situation showed that in schizophrenic patients the latency of early components P100 and N170 is shorter while the latency of later components P200 and P300--is longer than in healthy subjects. It could be supposed that the patients have deficit of the early automatic sensory processing of the stimuli revealing through the shortening of their recognition time and this results in the decrease of completeness and preciseness of sensory analysis. In the study there were also revealed negative correlations between the latencies of P100 and P200 components (P200 being a "recognition potential") in healthy subjects confirming the hy pothesis that longer sensory processing of verbal stimuli leads to the shortness of the time for its recognition. For schizophrenic patients the relation between the duration of sensory and cognitive ERP components is disturbed. They have positive correlations between the latencies of early and late components possibly on account of the nonspecific contribution both in early and late components while in normal subjects the early components are more specific than the late ones.