[High-frequency components of the electrical activity of the dog neocortex during formation of motor alimentary conditioned reflexes].

Power spectra of electrical activity of different dogs neocortical areas within a wide frequency band (1-100 Hz) were studied by correlation-spectral analysis during elaboration of motor (pressing the pedal) alimentary conditioned reflexes (CR) to acoustic stimuli. Considerable redistribution of autospectra power (ASP) within one of the five selected frequency ranges (from I to V, 20 Hz each) was observed. The frequencies of III-V ranges (41-100 Hz) were the most reactive; the degree of power increase after CR stabilization was determined by its initial level before CR elaboration which significantly differed in various animals. The weaker were presented in the EEG high frequencies before learning, the higher was the increase of their power in the process of elaboration of the given type of CR, and on the contrary, a definite level of "saturation" was preserved. Relatively low frequencies (below 20 Hz) were characterized after CR elaboration by lowering of the power. Deliberate lowering of the alimentary motivation led to a weakening of CR and power decrease (in comparison with stabilized CR) of all frequency components; however, its level remained higher, than before CR elaboration.