[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.

[Effect of stimulation of rostral portions of the midbrain reticular formation on the cat motor cortex]. / Vliianiia stimuliatsii rostral'nykh uchastkov retikuliarnoi formatsii srednego mozga na motornuiu koru koshki

Evoked potentials and responses of 139 neurones in the sensorimotor cortex (the lateral third of the posterior sigmoid gyrus) to electrical stimulation of the dorsolateral (DL) and the ventromedial (VM) areas of the mesencephalic reticular formation (MRF) were investigated in cats in acute and chronic experiments. Latencies of the cortical unit responses (in the form of single and multiple discharges) to MRF stimulation varied from 4 to 36 msec for VM (maxima of distribution: 4--10 and 18--24 msec); those for DL were from 4 to 26 msec (maxima of distribution: 4--6 and 14--16 msec). Responses to both DL and VM stimulation were observed in 29 neurones. As for MRF, its effects (mono-and polyvalent) were found in cortical neurones responding to limb electrocutaneous stimulation as well. At 7--10 days after coagulation of the ipsilateral connection between MRF and the pons, persistence of the cortical response main components was recorded, the long-latency part being slightly reduced.

[Effects of stimulating the caudal zones of the mesencephalic reticular formation on the postcruciate cortex of the cat]. / Effekty stimuliatsii kaudal'nykh zon mezéntsefalicheskoi retikuliarnou formatsii na postkrutsiatnuiu koru koshki

The influence of the electrical stimulation of the dorsolateral (DL) and the ventromedial (VM) portions of the caudal area of the mesencephalic reticular formation on the neuronal activity of the lateral zone of the gyrus sygmoideus posterior was investigated in cats. The mesencephalo-cortical influences were mainly excitatory in character; the predominance of the neuronal reactions with a short latency (3--12 msec) during the VM stimulation and reactions with a longer latency (20--25 msec) during the DL stimulation was revealed. The VM and the DL were found to influence both cortical neurones, the ones sensitive to somesthetic stimuli (mono-, di- and polyvalent) and the ones which failed to respond to the electrocutaneous stimulation of the limbs.