SPATIOTEMPORAL ORGANIZATION OF CORTICAL P OTENTIALS OF RABBITS DURINGACTIVE BEHAVIOR INDUCED BY INTRINSIC NEED

The studies of successive momentary topograms of cortical potentials i n freely moving rabbits revealed peculiarities of the regulation of th e EEG spatial synchronization (SS) during rest and active phases of th e bacis behavioural cycle. The animal's movements of the active phase caused by intrinsic need were related to an increase in the influence of the global level fluctuations of the momentary topograms. During co nditioned motor activity the topogram relief reorganization played a p rominent part in the process of the SS formation. Comparison of these data alowed a conclusion that the peculiarities of the SS structure of the cortical potentials were determined by the ratio between the two. processes which make up the EEG spatio-temporal organization rather t han the degree of their expression. In case of the dominance of the to pogram relief reorganization the state of the animal was related with the most frequently occurring topogram forms.