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  • 1
    Electronic Resource
    Electronic Resource
    Patterns of neuronal functioning in the hypothalamus and cerebral cortex of rats in different motivational/emotional states (1997)
    Springer
    Bulletin of experimental biology and medicine 123 (1997), S. 434-438 
    Details
    ISSN: 1573-8221
    Keywords: neuronal activity ; hypothalamus ; cerebral cortex ; motivational/emotional states ; behavior
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Firing activity of the same neurons and neuronal pairs in the hypothalamus and cerebral cortex is analyzed in rats during four consecutive motivational/emotional states controlled at the behavioral level (states of motivation, removed motivation, predominantly positive emotions, and predominantly negative emotions). Generalized characteristics of neuronal activity are identified that reflect the four states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02445310
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  • 2
    Electronic Resource
    Electronic Resource
    The reflection of the plastic properties of the simplest neuronal junctions in the statistical characteristics of the impulse activity of their elements. Polysynaptically linked neurons (1987)
    Springer
    Neuroscience and behavioral physiology 17 (1987), S. 20-26 
    Details
    ISSN: 1573-899X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Conclusions 1. The regularities of change in the normalized histogram of the correlation of impulse trains of disynaptically linked neurons, in the presence of changes in efficiency of interneuronal, monosynaptic links, in the excitability of neurons, and in the summated effect upon them of independent, irregular, afferent, synaptic inputs, were studied, using a mathematical model of neuronal interaction. 2. The amplitude of the basic maximum (minimum) of the normalized histogram of disynaptically linked neurons (meaning also the degree of dependence of their impulse trains) increases both with increase in the amplitude of the postsynaptic potentials which allow for a functional link between these neurons, and with decrease in the frequency of discharges of any of them (but not of the interneuron) which is conditional upon a decrease in the sweep of the irregular, exogenous oscillations of its membrane potenital or an increase in the threshold of generation of the impulse. 3. In the case of an excitatory, disynaptic link between the neurons, the increase in the degree of dependence of their impulse trains has a limit, determined by the greatest of the mean frequencies of the discharges of the pre- and postsynaptic neurons. 4. It is impossible only by the character of the modification of the cross-over-correlational histogram of the impulse trains of polysynaptically linked neurons to establish the true physiological cause of this modification. It is necessary also to take into account the character of the mean frequency of the discharges of the neurons studied. 5. The increase in the amplitude of the basic maximum (if the link is excitatory), or of the basic minimum (if the link is inhibitory), of the normalized cross-over-correlational histogram of their impulse trains, which accompanies the increase in the mean frequency of the discharges (the decrease in mean interspike intervals) of both neurons, is an unambiguous indicator of an increase in the efficiency of the disynaptic link between neurons (as a result of modification of synapses or change in the functional state of the interneuron).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01186802
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  • 3
    Electronic Resource
    Electronic Resource
    Identification of a latent state arising in the hippocampus following the cessation of long-term potentiation (1994)
    Springer
    Neuroscience and behavioral physiology 24 (1994), S. 394-399 
    Details
    ISSN: 1573-899X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The possibility of the restoration of long-term potentiation in the CA1 region and the dentate gyrus of the hippocampus during stimulation respectively of the dorsal raphé nuclei and locus coeruleus, with stimulus parameters inducing behavioral reactions, was investigated in freely-behaving rats. It was demonstrated that stimulation of the locus coeruleus, which was ineffective prior to the tetanization of the perforant path, led to the restoration of extinguished long-term posttetanic potentiation in the dentate gyrus of the hippocampus induced by tetanization of the perforant path. Stimulation of the dorsal raphé nucleus, which was ineffective prior to the tetanization of the Schaffer collaterals, led to the restoration of long-term posttetanic potentiation in the CA1 region of the hippocampus induced by tetanization of the Schaffer collaterals. A mathematical model is proposed which has made it possible to describe the restoration of long-term posttetanic potentiation on the basis of the notion of the existence of several states of calcium/calmodulin-dependant protein kinase. The restoration of long-term potentiation during stimulation of emotiogenic zones was examined as a model of the phenomenon of emotional reminding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02359790
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  • 4
    Electronic Resource
    Electronic Resource
    Reflection of plastic properties of two neurons with common monosynaptic input by statistical analysis of their firing pattern (1987)
    Springer
    Neuroscience and behavioral physiology 17 (1987), S. 131-135 
    Details
    ISSN: 1573-899X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Conclusions 1. The principles governing changes in the normalized cross-correlation histogram (CCH) of spike trains of neurons N1 and N2, having a common monosynaptic excitatory or inhibitory-excitatory input from N3 were investigated by methods of mathematical and biomathematical modeling of neuronal interaction, in the presence of changes in the efficiency of interneurronal synaptic connections, excitability of the neurons, and the combined action of independent random afferent synaptic flows on them. 2. It was shown that the amplitude of the central peak (trough) of the normalized CCH of N1-N2 is increased both with an increase in the amplitude of excitatory postsynaptic potentials of Nl and of excitatory (inhibitory) potentials of N2 evoked by spikes from N3, and with an increase in the mean interspike interval of any of the neurons, due to narrowing of the range of random exogenous fluctuations of membrane potentials or elevation of the threshold of spike generation. 3. If N1 and N2 are excited by N3, the region of change of the degree of dependence of spike trains of N1 and N2, estimated relative to the central peak of the CCH of N1–N2, has an upper limit determined by the minimal of the values of the mean interspike intervals of N1 and N2. 4. It is impossible to determine the true physiological cause of the modification purely by the character of the modification of CCH of N1–N2 observed in the course of the experiment. The character of accompanying changes in the mean interspike intervals of N1 and N2 must also be taken into account. 5. It was shown that an increase in amplitude of the central peak (trough) of the normalized CCH of N1–N2, accompanied by a decrease in the mean interspike intervals of N1 and N2 is a sign either of an increase in the amplitude of the postsynaptic potentials of N1 and N2, evoked by spikes from the unrecorded N3, or of an increase in the mean interspike interval of N3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01184903
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  • 5
    Electronic Resource
    Electronic Resource
    Reflection of plasticity of two monosynaptically interconnected neurons in the statistical characteristics of their spike discharge (1987)
    Springer
    Neuroscience and behavioral physiology 17 (1987), S. 500-505 
    Details
    ISSN: 1573-899X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Conclusions 1. Principles governing a change in cross-correlation histograms (CCH) of spike trains of monosynaptically interconnected neurons, and values calculated from the principal peak for troughs of CCH were investigated by methods of mathematical and biomathematical models of neuronal interaction to assess the degree of dependence between spike trains due to the action of direct and reciprocal connections, in the presence of changes in the efficiency of interneuronal connections and excitability of the neurons and of the action of independent random afferent synaptic inflows on them. 2. The amplitude of the principal peak (trough) of the normalized CCH of the spike trains of monosynaptically interconnected neurons increases both with an increase in amplitude of the corresponding excitatory (inhibitory) postsynaptic potential and with an increase in the mean interspike interval of any neuron, due to a decrease in the range of random exogenous oscillations of its membrane potential or elevation of its thresholds of spike generation. The increase in amplitudes of the principal peak of the CCH has a limit determined by the minimal of the average interspike intervals of the interconnected neurons. 3. It is impossible to establish the true physiological cause of the modification of CCH of the spike trains of monosynaptically interconnected neurons purely from the character of that modification observed in the course of the experiment. The character of changes in the mean interspike intervals of the test neurons must also be taken into account. 4. An increase in amplitude of the principal peak or trough of the normalized CCH of the spike trains of the neurons, accompanied by reduction of their mean interspike intervals, is an unambiguous sign of an increase in the efficiency of a monosynaptic excitatory or inhibitory connection between neurons, i.e., an increase in the amplitude of the corresponding excitatory (or inhibitory) postsynaptic potential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01186348
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  • 6
    Electronic Resource
    Electronic Resource
    Types of correlations of neuronal firing patterns in the visual and sensorimotor areas of the rabbit neocortex (1987)
    Springer
    Neuroscience and behavioral physiology 17 (1987), S. 453-460 
    Details
    ISSN: 1573-899X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Conclusions 1. Analysis of the shape of cross-correlation histograms (CCH) of the spike train of visual and sensorimotor cortical neurons, constructed with a bin width of 2 msec, did not give convincing proof of the existence of synaptic connections between the cells, or of influences from a common source, effected through a small number of relays on interneurons. 2. Analysis of CCH constructed from the same fragments of the spike train, with bin widths of 10 and 30 msec, enabled primary peaks and troughs, determining the type of neuronal interaction, and additional peaks, which could reproduce the particular shape of the autocorrelation histograms of spike trains of the recorded neurons, to be distinguished. The wide central peaks, with a base covering the origin of coordinates, were found in 51.9% of cases, wide peaks considerably shifted relative to the origin of coordinates in 40.9%, and troughs in 7.2% of cases. 3. The shape of the CCH was evidence that two main mechanisms give rise to the appearance of correlated discharges: the action of a common input and the influence of neurons of one region on another through a large number of interneurons. It was not always possible to separate these two cases by means of the CCH. Sometimes a more complex interaction might be suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01186341
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  • 7
    Electronic Resource
    Electronic Resource
    Interaction of neurons of the visual and sensorimotor regions of the neocortex during elaboration and extinction of a conditioned defensive reaction (1986)
    Springer
    Neuroscience and behavioral physiology 16 (1986), S. 207-214 
    Details
    ISSN: 1573-899X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Conclusions 1. During the stage of the generalization of the defensive CR, the number of pairs of correlatively active neurons in the cortical representations of the conditioned and unconditioned stimuli increased somewhat (64%) in comparison with the numbers in the initial stages of training (50%) and pseudoconditioning (54%). During the stage of CR stabilization, the number of interacting pairs of neurons decreased (33%). 2. The slow wave, high amplitude activity in the cortex during the initial stage of training and during the pseudoconditioning was conjugated to the greater degree with the corresponding activities of the neuron pairs than was activation on the EEG. During the stage of CR stabilization, the correlations of the activites of the neurons in the presence of SWs was weakened. 3. The number of pairs of neurons with correlated activity increased during activation on the EEG in the stage of CR generalization and stabilization but decreased during extinction. 4. It is suggested that synchronization of the activity of the cortical neurons can be accomplished both under the influence of excitatory effects (from the subcortical structures or from other regions of the cortex) and due to the operation of the inhibitory system of the cortex. The results of the research indicate that the participation of the two indicated systems is different during different stages of the elaboration and extinction of the CR.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01149488
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  • 8
    Electronic Resource
    Electronic Resource
    Analysis of spike activity of two neurons monosynaptically excited by a third, using cross-correlation histograms and cos' method. Possibility of detecting plasticity of neurons and synapses (1990)
    Springer
    Neuroscience and behavioral physiology 20 (1990), S. 178-184 
    Details
    ISSN: 1573-899X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Exogenous stationary random single spike activity of two neurons (N1 and N2), monosynaptically excited by a third (N3), was reproduced by a mathematical model. The degree of dependence of spike trains of N1 and N2 was assessed by the value of P12, determined by cross-correlation histogram, and Cox' coefficient β12. The dynamics of P12 and β12 and also values of P1*, P2*, and P3*, proportional to the mean interspike intervals of N1, N2, and N3 were investigated during changes in the efficiency of synaptic connections, excitability of the neurons, and their response to afferent synaptic bombardment. It was shown that an increase (decrease) in P12 or β12, accompanied by a decrease (increase) in p1′ and P2′, is a sign of a plastic change either in the discharge frequency of N3 (not always recorded experimentally) or of the amplitudes of excitatory postsynaptic potentials of N1 and (or) N2, evoked by these discharges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01268138
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