[Effect of disruption of the entopeduncular nucleus on rat behavior in simultaneous discrimination and open field tests]]. / Vliianie razrusheniia éntopedunkuliarnogo iadra na povedenie krys v usloviiakh odnovremennogo razlicheniia i otkrytogo polia.

The influence of unilateral destruction of n. entopeduncularis on learning and retention of simultaneous discrimination in a T-maze and adaptation in the open filed was studied in 29 adult rats. Destruction of n. entopeduncularis in rats resulted in appreciable deviations from the normal behavior during realization of earlier acquired simultaneous discrimination and slowing down of the acquisition of a new habit. Differences in behavioral activity of the lesioned animals in the maze and open field were revealed.

[Extinction of the defensive conditioned reflex in cats after lesioning the endopeduncularis nucleus]. / Ugashenie oboronitel'nogo uslovnogo refleksa u koshek posle razrusheniia éntopedunkuliarnogo iadra.

Influence of bilateral destruction of nucleus entopeduncularis on the extinction of conditioned avoidance was studied in 10 adult cats. It was shown that bilateral destruction of the nucleus entopeduncularis led to a disturbance of storage of the previous conditioning and facilitated repeated extinction.

[Subcortical structures of the brain and the behavior of white rats]. / Podkorkovye struktury mozga i povedenie belykh krys.

Conditioned food and defensive reflexes have been studied in white rats following bilateral injury of paleo-, archi-, neostriatum, substantia nigra and paleocortex. It has been shown that these deep structures play a role in the operational memory of animals.

[Participation of the basal ganglia in the mechanism of visual memory in the rat]. / Uchatie bazal'nykh gangliev v mekhanizmakh zritel'noi pamiati u krys.

Studies have been made of the effect of bilateral injury of paleo-, archi- and neostriatum, as well as that of the nucleus ruber on adaptive behaviour in albino rats. It was shown that injury of the basal structures of the brain results in disturbances of optimal visual choice of a food signal. The data obtained are discussed from a standpoint of disturbances in operative memory of visual signals. It is suggested that during evolutionary development, when the higher brain functions pass to neocortex, the basal ganglia do not loose their initial role in the higher analytical-synthetic activity.

[Role of the globus pallidus in memory mechanisms]. / Uchastie blednogo shara v mekhanizmakh pamiati.

The role of the pallidum in memory mechanisms was studied in cats by different methods of conditioned reflexes. It has been shown that a bilateral partial lesion of the Globus pallidus leads to "forgetting" sequences in delayed alternation and electrical punishment in previous experiments as well as to disturbances of the perceptual memory.

[Effect of damage to the substantia nigra on conditioned reflex activity in animals]. / Vliianie povrezhdeniia chernoi substantsii na uslovnoreflektornuiu deiatel'nost' zhivotnykh.

Effects of the Substantia nigra injury on conditioned activities were studied on rats and cats by defensive and feeding methods, respectively. Bilateral injury of the Substantia nigra led to temporary disappearance of conditioned defensive and feeding motor reflexes, to prolongation of latency and duration of motor reaction. In cats the injury of the Substantia nigra produced a 30--40% decrease of the accuracy of food direction choice. Similar changes were observed following injury of the Nucleus caudatus head.

[Conditioned motor-alimentary reflexes in cats following ablation of the body of Luys]. / Uslovnye dvigatel'no-pishchevye refleksy pri povrezhdenii tela Liuisa u koshek.

Alimentary conditioned motor reflexes in cats were elaborated in special chambers. Subsequently, the subthalamic nucleus was damaged, first on one and then on the other side. After its unilateral destruction, temporary disturbance in the cat behaviour was observed disappearing within 2--3 weeks. Bilateral destruction of the subthalamic nucleus led to a stable disturbance in the reaction of choice of reinforcement side in conditions of uncertainty.

[Role of the globus pallidus in establishing delayed responses in cats]. / Rol' blednogo shara v osushchestvlenii otsrochennykh reaktsii u koshek.

Unilaternal ablation of the pallidum leads to acute disturbances in delayed reaction in cats. In the case of a 3 or 5 sec delay the accuracy of finding the food behind the screan or of the choice of the side of reinforcement drops by 30 to 40%; in the case of a delay of 10 sec this accuracy drops by 55 to 60%. Along with this and as a natural result, it takes the cat a longer time to get to the place where the food is kept. At a 15 sec delay, the previously elaborated delayed reactions disappear completely. After a bilateral incomplete ablation of the pallidum, only some cats with light pallidal lesions succed in acquiring delayed reactions (in 22 to 29% of cases) with a minimum pause (3 sec). It is assumed that the pallidum takes part in the mechanisms of comparison and retention of the traces of sensory information in the apparatus of memory.

[The role of the pallidum in regulating cortical activity]. / Rol' palliduma v reguliatsii korkovoi aktivnosti

Bilateral ablation of the pallidum halves the duration of extinction of conditioned motor food reflexes and contributes to 30 to 50% extinction of the electro-defensive reflexes. Pallidum functional depression by potassium chloride or novacaine leads to a temporary total depression of conditioned motor food reflexes. Depending on the frequency of pallidum stimulation, synchronization or desynchronization of the cortical bioelectrical activity is observed. Ablation of the pallidum in anaesthetized cats results in a high amplitude and low-frequency cortical activity. Injection of large doses of potassium chloride into the pallidum results in a forced running forward which lasts 30 to 40 min. The pallidum is considreed as a structure controlling the cortex activity, which takes part in the mechanisms of sensory information processes in the course of adaptive behaviour.