Evoked potentials as an index of shaping of avoidance behavior mechanisms

We proceeded from Adrianov's concept considering the spatial and temporal changes in the brain system macroensembles to be stipulated by the dynamics of different influences from the external and internal media of the organism. It retraces the sequence of shaping of central-peripheral relations in securing an avoidance reaction. We judged the involvement of certain brain formations in the central architecture, of the reaction by localization and parameters of evoked potentials (EP) collating these with the behavior of the animal. Certain accordance has been found between the structural composition of the central integration and the leading component of the system. At the beginning, the role of the leading system component is carried out by a complex of afferent influences arising from pain stimulation. Later on, defensive motivation becomes the leading system component and organizes the new intercentral relationships. With correct responses increasing, the degree of motivational excitation reduces and the role of the afferent influences from the apparatus of motor reaction augments, that is, the afferentation which becomes the leading one. In animals with different auditory analyser parts ablated the neocortical zone of the analyser is involved in the behavioral organization at all stages but by extralemniscal paths.