S P Narikashvili

Publications (6)0 Total impact

• Article: Microphysiological analysis of pyramidal and a kind of inhibitory interneuronal (probably basket cell) activity in the dorsal hippocampus of the cat.

  P Molnár, V S Arutyunov, S P Narikashvili
  Acta physiologica Academiae Scientiarum Hungaricae 02/1971; 40(3):387-91.
• Article: Effect of somatosensory cortex on spontaneous activity in association cortex

  S. P. Narikashvili, V. S. Arutyunov, E. S. Moniava
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  ABSTRACT: 1. The application of strychnine to a localized area of the primary somatosensory cortex causes an increase in frequency of spontaneous discharge of its neurons with the appearance of paroxysmal bursts, and at the same time, depression (or even complete suppression) of spontaneous neuron activity in the anterior part of the middle suprasylvian gyrus. 2. Depression of spontaneous neuronal activity in the association area is also observed (even better) when the spontaneous activity of the neurons in this area is intensified by a previous application of weak strychnine solution. 3. Spontaneous activity of neurons of any other, nonassociative, cortical area (the anterior ectosylvian gyrus, for example), situated the same distance from the part of the somatosensory cortex poisoned by strychnine, remains unchanged under these conditions. 4. The application of strychnine to the association area of the middle suprasylvian gyrus does not change the spontaneous or paroxysmal activity of neurons in the primary somatosensory cortex.
  Neuroscience and Behavioral Physiology 11/1967; 1(4):397-402.
• Article: Mechanism of the influence of the reticular formation on cortical neurons

  S. P. Narikashvili, E. S. Moniava, V. S. Arutyunov
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  ABSTRACT: 1. Under the influence of stimulation of the mesencephalic reticular formation (MRF) activity of neurons in the visual cortex usually remains unchanged but may be either facilitated or depressed. 2. Under certain conditions bursts of synchronized impulses occur in response to photic stimulation at low frequencies and stimulation of MRF then abolishes the periodicity of the impulse discharge. 3. Since the periodicity of such bursts of synchronized impulses probably develops as the result of an inhibitory postsynaptic potential, the facilitation of cortical neurons by influences from MRF must be based on abolition of an inhibitory process.
  Neuroscience and Behavioral Physiology 05/1967; 1(2):160-168.
• Article: Unit activity of raphe nuclei in the cat brainstem.

  S P Narikashvili, V S Arutyunov, T G Tatevosyan
  Neuroscience and Behavioral Physiology 5(3):225-34.
• Article: Unit activity of bulbar raphe nuclei and reticular formation in cats.

  V S Arutyunov, S P Narikashvili, T G Tatevosyan
  Neuroscience and Behavioral Physiology 6(1):16-24.
• Article: Interaction between the primary sensory and association areas of the cerebral cortex in the cat

  S.P. Narikashvili, V.S. Arutyunov, Emilio Guma, E.S. Moniava
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  ABSTRACT: The influence of strychninization of the primary somatosensory cortex (SI) on the spontaneous and evoked activity units of the anterior part of the middle suprasylvian (AMSA) was studied in cats. Strychninization of the SI causes suppression (until a complete cessation) of spontaneous, seizure and evoked activity of mono- and polysensory neurons in the AMSA. Suppression of the evoked discharges to stimuli of different modalities does not occur simultaneously, there seems to exist a certain time sequence. After strychnine has been washed away from the somatosensory cortex, spontaneous and evoked activity of the association neurons recover to the initial level. Strychninization of the AMSA does not give any remarkable changes in the spontaneous and seizure activity of neurons of the somatosensory cortex. Discussed in the paper is a possible mechanism of the interaction and preferentially one-side functional connection between the SI and the AMSA.
  Physiology & Behavior.