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The K-complex and slow oscillation in terms of a mean-field cortical model

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Abstract

We use a mean-field macrocolumn model of the cerebral cortex to offer an interpretation of the K-complex of the electroencephalogram to complement those of more detailed neuron-by-neuron models. We interpret the K-complex as a momentary excursion of the cortex from a stable low-firing state to an unstable high-firing state, and hypothesize that the related slow oscillation can be considered as the periodic oscillation between two meta-stable solutions of the mean-field model. By incorporating a Hebbian-style learning rule that links the growth in synapse strength to fluctuations in soma potential, we demonstrate a self-organization behaviour that draws the modelled cortex close to the edge of stability of the low-firing state. Furthermore, a very slow oscillation can occur in the excitability of the cortex that has similarities with the infra-slow oscillation of sleep.

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Correspondence to M. T. Wilson.

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Action Editor: Nicolas Brunel

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Wilson, M.T., Steyn-Ross, D.A., Sleigh, J.W. et al. The K-complex and slow oscillation in terms of a mean-field cortical model. J Comput Neurosci 21, 243–257 (2006). https://doi.org/10.1007/s10827-006-7948-6

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  • DOI: https://doi.org/10.1007/s10827-006-7948-6

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