[Structure of receptive fields of visually sensitive neurons of the cat hippocampus]. / Stroenie retseptivnykh polei zritel'nochuvstvitel'nykh neironov gippokampa koshki.

Structure of receptive fields of visually sensitive neurons in areas CA1 and CA3 of the dorsal hippocampus was investigated in alert cats with the brain-stem pretrigeminal section. The receptive field (RF) structure of 76 hippocampal neurons was analyzed by methods of scanning the RF by moving stimuli and mapping all their surface by a stationary flashing spot. According to presented data the neurons were classified into three groups: neurons with homogeneous structure of the RF (54%), with nonhomogeneous (28%) and neurons more sensitive to stimulus motion (18%) than to a stationary flashing light. Experiments have shown that responses of hippocampal neurons are highly specific ones. Thus, 9% of neurons with the nonhomogeneous RF structure have shown specific responses to variation of the contrast and contours of moving stimuli. The presented results show that hippocampal visually driven neurons have well developed mechanism for processing visual sensory information and apparently this quality ensures participation of the limbic system in visually controlled behavior of the animal.

[The short-latency reactions of the limbic cortex neurons to stimulation of the amygdaloid complex]. / Korotkolatentnye reaktsii neironov limbicheskoi kory na razdrazhenie amigdaliarnogo kompleksa.

The extracellular electrical activities of the anterior limbic cortex (LC) neurons to electrical stimulation of amygdaloid central and basolateral nuclei in anesthetized cats was investigated. The orthodromic and antidromic responses of silent-neurons of LC were registered. These results show the existence of short and direct bilateral connections between the anterior LC and different amygdaloid nuclei. It is supposed, that these connections present a "quick-reacting" system, which takes part in the central regulation of the emotional responses.

[Neuronal activity of the limbic cortex in stimulation of the somatosensory areas]. / Aktivnost' neironov limbicheskoi kory pri stimuliatsii somatosensornykh zon.

The somatosensory areas C1 and C2 exert modulating influence on the activity of the limbic cortex neurones, thus participating in the regulation and processing of information coming to the limbic cortex.

[Spike activity of neurons of the limbic cortex in response to stimulation of the mammillary bodies of the hypothalamus and midbrain reticular formation]. / Impul'snaia aktivnost' neironov limbicheskoi kory na razdrazhenie mamilliarnykh iader gipotalamusa i retikuliarnoi formatsii srednego mozga.

IN anesthetized cats, short-latency orthodromic and antidromic responses of the limbic cortex neurons to stimulation of the mamillary body and reticular formation (RF) suggest the existence of short direct and feedback connections among these three structures. Histogram analysis revealed the responses of maximal potential compactness to stimulation of the RF. High-frequency stimulation of the mamillary body and the RF exerted mainly an inhibitory effect upon the limbic cortex neurons.

[Reactions of limbic cortex neurons to stimulation of the splanchnic and sciatic nerves and mammillary region of the hypothalamus]. / Reaktsii neironov limbicheskoi kory na razdrazhenie chrevnogo, sedalishchnogo nervov i mamilliarnoi oblasti gipotalamusa.

The background and evoked activities of the limbic cortex neurons to electrical stimulation of the splanchnic and ischiatic nerves and the mammillary body of the hypothalamus were investigated in anesthetized cats. In the presence of effective convergence of sensory visceral and somatic volleys on the limbic cortex neurons low convergence of volleys from the central hypothalamic and peripheral sources was observed. Orthodromic and antidromic responses to the stimulation of the mammillary body were detected testifying to the existence of direct bilateral connections between the anterior limbic cortex and the mammillary body.