[The thermal activity of the rabbit brain during the interaction of "animal hypnosis" and of the hunger dominant]. / Teplovaia aktivnost' mozga krolika pri vzaimodeistvii "zhivotnogo gipnoza" i dominanty goloda.

The character of interaction between two dominant foci (motivation hunger dominant and "animal hypnosis") which had been formed in the rabbit brain was ambiguous: the foci could either function simultaneously or compete. In the first case, summation food reactions were observed when the hunger dominant was tested during a hypnotic episode against the background of deep and continuous hypnotic state. Brain thermal activity was asymmetric the temperature being higher in the parieto-occipital areas of the left hemisphere. If the hypnosis inhibited the hunger dominant, summation reactions were absent and the brain temperature was higher in the parieto-occipital areas of the right hemisphere. In cases when despite the repeated immobilization sessions the hunger dominant prevented from induction of hypnosis, the left-hemisphere thermal dominance persisted against the background of general brain cooling.

[The interaction of "animal hypnosis" and the motivational dominant of hunger]. / Issledovanie vzaimodeistviia "zhivotnogo gipnoza" i motivatsionnoi dominanty goloda.

The study of the interaction between the "animal hypnosis" and hunger dominant after its multiple creation showed that the first applications of the forced immobilization against the background of hunger dominant optimum elicited the long-lasting hypnotic state of the animal (4-20 minutes). The hunger dominant was retained in hypnotic state of the animal, i.e., the testing stimuli produced summation swallowing and masticatory movements. Moreover, in some cases facilitatory influence of the "animal hypnosis" was observed on summation properties of the dominant focus in the motivational "hunger center". In the process of repetitions of "animal hypnosis" experiments against the background of the hunger dominant it became difficult to induce the hypnotic state in the majority of the animals, i.e., the longer fixation of rabbits was required and the duration of the hypnotic state reduced. These findings can be indicative of the inhibitory influence of hunger dominant on "animal hypnosis".

[A coherent analysis of the neocortical electrical activity on the cessation of a thirst dominant]. / Kogerentnyi analiz élektricheskoi aktivnosti neokorteksa pri prekrashchenii dominanty zhazhdy.

During learning of an animal to goal-directed discontinuation of the thirst dominant, the stable temporary connection established between the center where the dominant focus has been created and the center related to the goal-directed blinking reaction. Study of the spatio-temporal relations of neocortical biopotentials in rabbits learned to goal-directed behaviour showed that in the motivation state of thirst induced by water deprivation the level of coherence of the electrical activity in the low-frequency range increased between the frontal cortex (the swallowing center) and the blinking cortical center. The observed changes testify to the readiness of certain structures of the dominant constellation for realization of the temporary connection. Analysis of the EEG recorded in three successive 5-sec intervals which preceded blinking revealed a certain dynamics of changes in coherent characteristics. These findings reflect a functional ambiguity and phase course of the processes which accompany preparation for a goal-directed reaction. The blinking reaction occurs at the background of increasing correlation between electrical processes in symmetrical points of the cortical blinking center in the right and left hemispheres.

[The spectral characteristics of the rabbit neocortical biopotentials during the termination of a dominant for thirst]. / Spektral'nye kharakteristiki biopotentsialov neokorteksa krolika pri prekrashchenii dominanty zhazhdy.

Spectral analysis of neocortical electrical activity of rabbits during learning blinking reaction which was directed to cessation of thirst dominant, revealed significant increase of the spectral power most pronounced and regular in the delta-range. On the basis of these data a conclusion is drawn that during the goal-directed behaviour of the animal the cortical structures are involved in the dominant constellation. Comparison of the spectral characteristics of potentials recorded in three successive 5-second intervals which preceded blinking, revealed a certain specificity (temporal and related to different frequency ranges) of changes in electrical activity in different cortex areas. These findings reflected functional ambiguity and phase course of the processes which accompany preparation for the goal-directed reaction.

[The spectral characteristics of the electrical activity of the cortex and subcortex in the dominant of thirst]. / Spektral'nye kharakteristiki élektricheskoi aktivnosti kory i podkorki pri dominante zhazhdy.

Dominant of thirst was elaborated in water-deprived rabbits by sound stimuli. One judged about the formation of the dominant by a regular appearance of the swallowing or chewing reactions in response to testing stimulations. Spectral analysis of the brain electrical activity revealed a generalized lowering of the spectral power of the potentials of the studied cortical and subcortical areas all over the analysed frequency range. The paraventricular nucleus, the lateral preoptic and anterior hypothalamic areas, in spectrograms of which an increase of estimations in the slow frequency range took place, were an exception. Analysis of the electrical activity recorded at different moments of the dominant manifestation (the tonic state of dominant and that immediately before the summation movement) showed that to each of these dominant states corresponded an appropriate maximum in the theta-frequency range, probably reflecting different levels of motivational-emotional excitation.