THE DYNAMICS OF HIGH-FREQUENCY BRAIN ACTI VITY (UP TO 200 HZ) IN THE COURSE OF CONDITIONING REFLECTS THE FUNCTIONAL MOSAIC ORGANIZATION OF THE NEOCORTEX

The study was aimed to reveal frequency ranges of correlated changes o f power spectral densities of the brain electrical activity (EA) inclu ding the high-frequency components (HFC) in dogs (4 animals) by means of factor analysis technique, Spectral densities of EA in different co rtical areas and olfactory bulb were factorized, Relationships between the structure of the selected factors both by the parts of the total variance determined by them and their frequency loads suggest the regi onal and individual EA differences, In the process of learning (elabor ation of motor skill of pressing the food-dispenser pedal with a forep aw) the factor organization of the EA became substantially more compli cated, mainly, in the HFC-range (40-170 Hz). This was manifested in fo rmation of narrower frequency subbands of the HFC each of which being highly loaded (0.7-0.8) by one of the factors, The evidence obtained b y means of the FA was completely verified using original version of cl uster analysis.