[Intracortical mechanisms of stimulating and inhibiting processes: response to neurons in isolated cortical strips to direct electric stimulation].
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Action Potentials↗
Biomedical subjects
G A El'kina
Publications and source records attributed to G A El'kina.
[Morphological and electrophysiological characteristics of a neuronally isolated strip of the cerebral cortex of a non-anesthetized rabbit].
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Animals↗
Effect of level of spatial synchronization of cortical potentials on spread of evoked responses to cortical electrical stimulation.
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Afferent Pathways↗
[Reflection of short-term memory processes in electrographic indices].
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Adolescent↗
[Rhythmic activity in a neuronally isolated strip of rabbit cortex].
To test the ability of the neocortex to generate rhythmic potential oscillations, the composition of summary electrical activity of neuronally isolated necortex strip in the background and following rhythmic electrical stimulation of the strip was studied by means of computer in chronic experiments on rabbits. In the strip background activity oscillations appear in delta-, theta- and alpha-ranges which in some cases represent regular-rhythmic processes. Along with endogene activity rythmic theta-activity may be recorded which penetrates passively from the hippocampus (when it generates a regular high-amplitude theta-rhythm). It was found that the strip activity followed the stimulation rhythm and reproduced it during several seconds after the end of the stimulation. Driving was easier when the stimulation frequency was of 5 -- 7 c/s. Besides driving response, rhythm rearrangement often occured following stimulation manifested in appearance of rhythmic oscillations within theta-range independently on the frequency of the preceding stimulation.
Animals↗
[Circulation of neural impulses in the cerebral cortex].
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Animals↗
[An analysis of rhythmic oscillations in the theta-range recorded in an isolated stria of the rabbit sensorimotor cortex].
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Animals↗
[Changes in neuronal impulse reactions and evoked responses of the rabbit visual cortex upon elaboration of conditioned reflexes].
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Animals↗
[Distribution of evoked responses to electrical stimulation of the cortex at different levels of spatial synchronization of cortical potentials].
In computer controlled experiments it was shown that the averaged cortical responses to direct electrical stimulation, recorded in rabbit's intact cortex or in a neuronally isolated cortical slab, depend on the level of EEG spatial synchronization in the prestimulation period. Latencies of the evoked potentials in both structures were smaller, and their amplitudes -- higher, if stimulation coincided with periods of the maximal synchronization of the background biopotentials, as compared to the same parameters of responses, obtained during the minimal synchronization of potentials. It is assumed that synchronization of the cortical potentials may be provided to a certain degree by processes of intracortical nature and that the increase in the cortical synchronization proper is accompanied by an improvement of the conditions in which the excitation is conducted over the cortex.
Animals↗