[Cytochemical changes in the nucleic acids and proteins in the limbic structures of the rabbit brain during formation of a defensive conditioned reflex].

The intensity of cytochemical changes of nucleic acids and proteins of neurones in structures of the limbic circle was studied with the method of two-wave visible cytospectrophotometry and histoautoradiography at the early and late stages of conditioned defensive reflex formation. It was shown that at both stages there occurs an intensification (of different degree) of cytochemical changes level in all of the studied limbic structures. A the late stage of reflex elaboration, there is a redistribution of the level of cytochemical changes in the studied brain structures.

[Neuron-glia interrelations in the cerebral cortex of rabbits in the presence of a polarization dominant].

Neurochemical and morphological studies of individual cellular structures of different cortical layers suggest that the formation of "polarization" dominant is due to the activity of the V cortical layer. Primary involvement of interneurones and neuroglia has been revealed in the organization of the dominant trace effect and in processes related to memory. Comparison of electrophysiological and morphological characteristics of the "polarization" dominant shows that the reorganization of summary electrical activity of the neocortex tending to the predominance of delta-frequencies in the power spectrum and enhancement of biopotentials correlation within this frequency range, are determined by processes taking place in lower cortical layers.

[Avoidance reactions to a partner's pain stimulation in rats with local brain damage].

Avoidance reaction to pain stimulation of another individual was studied in white rats before and after lesion of the frontal, cingular, entorhinal cortex, septum and median gray matter. The avoidance reaction improved following destruction of the frontal cortex and deteriorated after lesion of the median gray matter. A conclusion has been drawn that the participation of various brain structures in the investigated reaction is closely connected with other functions of these structures.

[Avoidance reactions to painful stimulation of another individual following destruction of the rat amygdala].

Experiments in male albino rats have shown that bilateral lesion of the amygdala does not prevent avoidance conditioning to pain stimulation of another rat, improvement of the reaction after a painful action of the experimental animal and its extinction after the discontinuation of pain stimulation of the partner. Amygdalectomy performed after elaboration of a conditioned avoidance reaction, improves or worsens it, depending on which of the two rivaling motivations (sensitivity to signals of the other animal or fear of an open field) relatively predominanted in the given animal before the operation. The facts obtained suggest that the amygdala may be classified as belonging to the system of brain structures, where the "interrupting function" of emotions is achieved directing the behaviour to meet the predominant need.