[Dynamics of the statistical indices of evoked potentials in modally specific brain structures during the formation of defensive reflexes].

Interdependence of integrative processes in the relays of the analyzers of signal stimuli (auditory and visual) was estimated by EP parameters (latency, amplitude, and duration) of the first positive and negative components. It has been shown that the significance of the coefficients of correlation between EP parameters in the studied structures is determined by the stage of the behaviour formation; it also depends on the EP component chosen for the analysis. Significant correlation coefficients are timed to the active period in the formation of defensive conditioned reaction. In this period significant correlation coefficients for the parameters of the first positive EP component are established in various fields of cortical projection zones and between the parameters of the negative component in all relays of the analyzer. The data are treated from the viewpoint of adaptation of the analyser activity to the organism's needs at each stage in the formation adaptive behaviour and of the role of motivational influences in the organization of intraanalyzer integrations.