[Interrelationship between the auditory, parietal and sensomotor regions of the dog cerebral cortex during a defensive conditioned reflex]

Abstract

Interrelations between projection (auditory), associative (parietal) and integrative-triggering (sensorimotor) cortical areas were studied in dogs by EP parameters and localization during formation of defensive conditioned reflex to clicks. These interrelations were studied in intact animals and after ablation of either T3 areas or PI2 area of the auditory cortex. It was found that in intact animals auditory cortical areas are constantly involved in brain integrations whereas parietal ones show periodical participation (EPs in the parietal cortical area accompany some pairings of signal stimulus with reinforcement). Integrative-triggering cortical structures are involved in the systemic processes in the period of stabilisation of defensive reaction. After ablation of T3 area integrative-triggering cortical structures are turned on within a large exitation system from the beginning of the defensive reaction formation. After ablation of PI2 area parietal areas constantly participate in brain integrations. The nature of their participation in the forming of a given functional system is determined by the state of the auditory system or location of its injury.