SIMILARITY AND DIFFERENCE BETWEEN THE DOG S BY THE INDEXES OF ELECTRICAL-ACTIVITY OF THE FRONTAL-CORTEX, HIPPOCAMPUS, AMYGDALA, AND HYPOTHALAMUS

Eight dogs were bilaterally implanted with stainless steel electrodes in dorsal and ventral hippocampi (DHp, VHp), basolateral amygdala (BLA ), lateral hypothalamus (LH) and with silver spherical electrodes in t he frontal cortex (FC). The EEG of these structures was recorded in th e state of wakefulness without any stimulation. Rhythmical activity in the theta (4.4 +/- 0,05 Hz) and alpha (10.7 +/- 0.2 Hz) ranges was re vealed in all the dogs. Rhythm of the beta-2 range (22.4 +/- 0.1 Hr,) was recorded in four, and that of the beta-3 (37.8 +/- 0.5 Hz) only in two of the animals. The mean frequency of the theta-rhythm recorded i n the LH was higher (p < 0.001) than that in the VHp and AMB. The spec tral density in the theta range was higher in the VHp than that in the other structures (p < 0.01). The same values for the DHp and AMB were higher that for the LH (p < 0.001) and FC (p < 0.01). The spectral de nsities in the right DHp and VHp were higher than in the symmetrcal le ft derivations (p < 0.001). The dogs were different in the expression of specific rhythms, their frequency and power. These characteristics depended on the degree of emotional excitation and motor activity of t he dogs during recording of the electrical activity.