Synchronization and desynchronization in epilepsy: controversies and hypotheses

Abstract

Epilepsy has been historically seen as a functional brain disorder associated with excessive synchronization of large neuronal populations leading to a hypersynchronous state. Recent evidence showed that epileptiform phenomena, particularly seizures, result from complex interactions between neuronal networks characterized by heterogeneity of neuronal firing and dynamical evolution of synchronization. Desynchronization is often observed preceding seizures or during their early stages; in contrast, high levels of synchronization observed towards the end of seizures may facilitate termination. In this review we discuss cellular and network mechanisms responsible for such complex changes in synchronization. Recent work has identified cell‐type‐specific inhibitory and excitatory interactions, the dichotomy between neuronal firing and the non‐local measurement of local field potentials distant to that firing, and the reflection of the neuronal dark matter problem in non‐firing neurons active in seizures. These recent advances have challenged long‐established views and are leading to a more rigorous and realistic understanding of the pathophysiology of epilepsy.

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Cited by papers we hold 3

• Towards Operational Definition of Postictal Stage: Spectral Entropy as a Marker of Seizure Ending · 2017
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• The ictal wavefront is the spatiotemporal source of discharges during spontaneous human seizures · 2016
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• Dynamic Network Drivers of Seizure Generation, Propagation and Termination in Human Neocortical Epilepsy · 2015
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