[The chaotic component of the high-frequency EEG of the rabbit cerebral cortex in the formation of a defensive conditioned reflex].

A chaotic component of high-frequency EEG of rabbits was studied in the course of defensive conditioning by non-rhythmical light stimuli with electrical reinforcement applied to the paw. The regular changes were demonstrated in the dynamic parameters of the EEG chaotic component. Characteristic changes were revealed in the values of attractor dimensions of the high-frequency EEG recorded from all the cortical areas under study both under the action of the conditioned stimuli and in the conditioning situation before presentation of stimuli pairings. The changes were observed in the afferent and efferent cortical parts of the conditioned arc as well as in the cortical areas, to which the conditioned stimuli were not directly addressed. The obtained data made possible to observe changes in the morpho-functional structure of the conditioned reflex at the cortical level in the process of conditioning. Substantial differences were revealed between the early and late stages of this process.