[The dynamic characteristics of the chaotic component of the high-frequency EEG of the rabbit during the acquisition and extinction of the orientation reflex].

The chaotic component of the high-frequency EEG of the rabbit was studied during repeated presentation of non-rhythmical light stimuli. The chaotic component was found to be sensitive to the action of these stimuli, its reactions being variant in different cortical areas. Dimension changes were revealed corresponding to a manifestation of the phasic and tonic components of the orienting reaction. In the course of orienting reflex extinction the chaotic component characteristics changed in correspondence with the activation level shifts in the cortical areas under study.