Cortical Slow Potentials, Depolarization of Glial Cells, and Extracellular Potassium Concentration

Roitbak, A. I.

doi:10.1007/978-1-4757-1379-4_15

Cited by 8 publications

(5 citation statements)

References 10 publications

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“…Whether further factors, such as a contribution of glial cells to SP generation as has been suggested by Caspers and Speckmann (1974), Somjen (1973Somjen ( , 1975, Bauer (1993), Roitbak (1996), would be in¯uenced by weak EMF would require further clari®-cation.…”

Section: Discussionmentioning

confidence: 99%

Microwaves emitted by cellular telephones affect human slow brain potentials

Freude¹,

Ullsperger²,

Eggert³

et al. 2000

Eur J Appl Physiol

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The influence of electromagnetic fields (EMF) emitted by cellular telephones on preparatory slow brain potentials (SP) was studied in two experiments, about 6 months apart. In the first experiment, a significant decrease of SP was found during exposure to EMF in a complex visual monitoring task (VMT). This effect was replicated in the second experiment. In addition to the VMT, EMF effects on SP were analysed in two further, less demanding tasks: in a simple finger movement task to elicit a Bereitschaftspotential (BP) and in a two-stimulus task to elicit a contingent negative variation (CNV). In comparison to the VMT, no significant main EMF effects were found in BP and CNV tasks. The results accounted for a selective EMF effect on particular aspects of human information processing, but did not indicate any influence on human performance, well-being and health.

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Section: Discussionmentioning

confidence: 99%

Microwaves emitted by cellular telephones affect human slow brain potentials

Freude¹,

Ullsperger²,

Eggert³

et al. 2000

Eur J Appl Physiol

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“…Moreover, SP generators were overall more spread over the cortical surface, and given the many cases of adjacent generator positions, it is conceivable that SPs could represent a fringe effect stemming from the beta generating areas. SPs are for a long time known to be microscopically generated by a major contribution from the potassium buffering function of glia (Skinner and Molnar, 1983;Roitbak, 1993;Mitzdorf, 1993), in situations of increased overall neural firing, as seems to occur in areas active in the beta range. Finally, our phase analysis results present some weak evidence that cortical areas active in the beta range also oscillate in phase synchrony with each other, at least roughly accompanying the power changes.…”

Section: Induced Beta and Other Evidence For The Idiosyncrasy Of Cortmentioning

confidence: 99%

Interindividual variability in EEG correlates of attention and limits of functional mapping

Basile

Anghinah

Ribeiro

et al. 2007

International Journal of Psychophysiology

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“…Считается, что нейроглиальные клетки, в отличие от нейронов не обладают импульсной активностью и что они только способствуют осуществлению ими краткосрочных коммуникативных процессов в нервной системе, не принимая прямого участия в этом. Но следует обратить внимание на то, что процессы возбуждения нейронов оказывают влияние на происходящие в нейроглиальных клетках электрические явления вследствие наличия щелевых контактов между ними [313][314][315]. В свою очередь, наличие щелевых контактов между их мембранами обусловливает возможность распространения по ним процесса возбуждения, который идёт с декрементом.…”

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“…Результаты многочисленных исследований показывают их наличие как между нейронами, так и между ними и глиальными клетками [319][320][321][322], а также между отростками глиальных клеток и в синапсах. Например, они обнаружены в ГАМК-ергических синапсах интернейронов [313] и дендритных шипиках пирамидных нейронов [323][324][325]. Связь дендритных шипиков с глиальной сетью посредством щелевых контактов показана на примере трёхмерных реконструкций нейропильных объёмов в поле СА1 гиппокампа сусликов в трёх функциональных состояниях [326].…”

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Fundamentals of the modern theory of the phenomenon of "pain" from the perspective of a systematic approach. Neurophysiological basis. Part 1: A brief presentation of key subcellular and cellular ctructural elements of the central nervous system.

Poberezhnyi

Марчук

Shvidyuk

et al. 2019

PMJUA

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The phenomenon of “pain” is a psychophysiological phenomenon that is actualized in the mind of a person as a result of the systemic response of his body to certain external and internal stimuli. The heart of the corresponding mental processes is certain neurophysiological processes, which in turn are caused by a certain form of the systemic structural and functional organization of the central nervous system (CNS). Thus, the systemic structural and functional organization of the central nervous system of a person, determining the corresponding psychophysiological state in a specific time interval, determines its psycho-emotional states or reactions manifested by the pain phenomenon. The nervous system of the human body has a hierarchical structure and is a morphologically and functionally complete set of different, interconnected, nervous and structural formations. The basis of the structural formations of the nervous system is nervous tissue. It is a system of interconnected differentials of nerve cells, neuroglia and glial macrophages, providing specific functions of perception of stimulation, excitation, generation of nerve impulses and its transmission. The neuron and each of its compartments (spines, dendrites, catfish, axon) is an autonomous, plastic, active, structural formation with complex computational properties. One of them – dendrites – plays a key role in the integration and processing of information. Dendrites, due to their morphology, provide neurons with unique electrical and plastic properties and cause variations in their computational properties. The morphology of dendrites: 1) determines – a) the number and type of contacts that a particular neuron can form with other neurons; b) the complexity, diversity of its functions; c) its computational operations; 2) determines – a) variations in the computational properties of a neuron (variations of the discharges between bursts and regular forms of pulsation); b) back distribution of action potentials. Dendritic spines can form synaptic connection – one of the main factors for increasing the diversity of forms of synaptic connections of neurons. Their volume and shape can change over a short period of time, and they can rotate in space, appear and disappear by themselves. Spines play a key role in selectively changing the strength of synaptic connections during the memorization and learning process. Glial cells are active participants in diffuse transmission of nerve impulses in the brain. Astrocytes form a three-dimensional, functionally “syncytia-like” formation, inside of which there are neurons, thus causing their specific microenvironment. They and neurons are structurally and functionally interconnected, based on which their permanent interaction occurs. Oligodendrocytes provide conditions for the generation and transmission of nerve impulses along the processes of neurons and play a significant role in the processes of their excitation and inhibition. Microglial cells play an important role in the formation of the brain, especially in the formation and maintenance of synapses. Thus, the CNS should be considered as a single, functionally “syncytia-like”, structural entity. Because the three-dimensional distribution of dendritic branches in space is important for determining the type of information that goes to a neuron, it is necessary to consider the three-dimensionality of their structure when analyzing the implementation of their functions.

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Cortical Slow Potentials, Depolarization of Glial Cells, and Extracellular Potassium Concentration

Cited by 8 publications

References 10 publications

Microwaves emitted by cellular telephones affect human slow brain potentials

Microwaves emitted by cellular telephones affect human slow brain potentials

Interindividual variability in EEG correlates of attention and limits of functional mapping

Fundamentals of the modern theory of the phenomenon of "pain" from the perspective of a systematic approach. Neurophysiological basis. Part 1: A brief presentation of key subcellular and cellular ctructural elements of the central nervous system.

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