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Journal of Computational Neuroscience

Erschienen in:

01.04.2009

The influence of sodium and potassium dynamics on excitability, seizures, and the stability of persistent states: II. Network and glial dynamics

verfasst von: Ghanim Ullah, John R. Cressman Jr., Ernest Barreto, Steven J. Schiff

Erschienen in: Journal of Computational Neuroscience | Ausgabe 2/2009

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Abstract

In these companion papers, we study how the interrelated dynamics of sodium and potassium affect the excitability of neurons, the occurrence of seizures, and the stability of persistent states of activity. We seek to study these dynamics with respect to the following compartments: neurons, glia, and extracellular space. We are particularly interested in the slower time-scale dynamics that determine overall excitability, and set the stage for transient episodes of persistent oscillations, working memory, or seizures. In this second of two companion papers, we present an ionic current network model composed of populations of Hodgkin–Huxley type excitatory and inhibitory neurons embedded within extracellular space and glia, in order to investigate the role of micro-environmental ionic dynamics on the stability of persistent activity. We show that these networks reproduce seizure-like activity if glial cells fail to maintain the proper micro-environmental conditions surrounding neurons, and produce several experimentally testable predictions. Our work suggests that the stability of persistent states to perturbation is set by glial activity, and that how the response to such perturbations decays or grows may be a critical factor in a variety of disparate transient phenomena such as working memory, burst firing in neonatal brain or spinal cord, up states, seizures, and cortical oscillations.

Vorheriger Artikel The influence of sodium and potassium dynamics on excitability, seizures, and the stability of persistent states: I. Single neuron dynamics

Nächster Artikel MAP estimation algorithm for phase response curves based on analysis of the observation process

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Titel: The influence of sodium and potassium dynamics on excitability, seizures, and the stability of persistent states: II. Network and glial dynamics
verfasst von: Ghanim Ullah
John R. Cressman Jr.
Ernest Barreto
Steven J. Schiff
Publikationsdatum: 01.04.2009
Verlag: Springer US
Erschienen in: Journal of Computational Neuroscience / Ausgabe 2/2009
Print ISSN: 0929-5313
Elektronische ISSN: 1573-6873
DOI: https://doi.org/10.1007/s10827-008-0130-6

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