Cortical local and long-range synchronization interplay in human absence seizure initiation

Amor, Frédérique; Baillet, Sylvain; Navarro, Vincent; Adam, Claude; Martinerie, Jacques; Quyen, Michel Le Van (2009). Cortical local and long-range synchronization interplay in human absence seizure initiation. NeuroImage, 45(3), pp. 950-62. San Diego, Calif.: Elsevier 10.1016/j.neuroimage.2008.12.011

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Brain activity relies on transient, fluctuating interactions between segregated neuronal populations. Synchronization within a single and between distributed neuronal clusters reflects the dynamics of these cooperative patterns. Thus absence epilepsy can be used as a model for integrated, large-scale investigation of the emergence of pathological collective dynamics in the brain. Indeed, spike-wave discharges (SWD) of an absence seizure are thought to reflect abnormal cortical hypersynchronization. In this paper, we address two questions: how and where do SWD arise in the human brain? Therefore, we explored the spatio-temporal dynamics of interactions within and between widely distributed cortical sites using magneto-encephalographic recordings of spontaneous absence seizures. We then extracted, from their time-frequency analysis, local synchronization of cortical sources and long-range synchronization linking distant sites. Our analyses revealed a reproducible sequence of 1) long-range desynchronization, 2) increased local synchronization and 3) increased long-range synchronization. Although both local and long-range synchronization displayed different spatio-temporal profiles, their cortical projection within an initiation time window overlap and reveal a multifocal fronto-central network. These observations contradict the classical view of sudden generalized synchronous activities in absence epilepsy. Furthermore, they suggest that brain states transition may rely on multi-scale processes involving both local and distant interactions.

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > Department of Head Organs and Neurology (DKNS) > Clinic of Neurology

UniBE Contributor:

Amor, Frédérique








Factscience Import

Date Deposited:

04 Oct 2013 15:13

Last Modified:

05 Dec 2022 14:22

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URI: (FactScience: 197129)

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