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Open AccessJournal ArticleDOI

Functional and structural brain networks in epilepsy: What have we learned?

TLDR
This review focuses on the application of a theory, called “network analysis,” to characterize resting‐state functional and structural networks and discusses current and future clinical applications of network analysis in patients with epilepsy.
Abstract
Brain functioning is increasingly seen as a complex interplay of dynamic neural systems that rely on the integrity of structural and functional networks. Recent studies that have investigated functional and structural networks in epilepsy have revealed specific disruptions in connectivity and network topology and, consequently, have led to a shift from "focus" to "networks" in modern epilepsy research. Disruptions in these networks may be associated with cognitive and behavioral impairments often seen in patients with chronic epilepsy. In this review, we aim to provide an overview that would introduce the clinical neurologist and epileptologist to this new theoretical paradigm. We focus on the application of a theory, called "network analysis," to characterize resting-state functional and structural networks and discuss current and future clinical applications of network analysis in patients with epilepsy.

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Citations
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Journal ArticleDOI

Modern network science of neurological disorders

TL;DR: Modern network science has revealed fundamental aspects of normal brain-network organization, such as small-world and scale-free patterns, hierarchical modularity, hubs and rich clubs, to use to gain a better understanding of brain disease.
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Defining epileptogenic networks: Contribution of SEEG and signal analysis

TL;DR: The historical, methodologic, and conceptual bases of the epileptogenic networks model are described in the analysis of electrophysiologic intracerebral recordings for better predicting the effects of epilepsy surgery.
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The trees and the forest: Characterization of complex brain networks with minimum spanning trees.

TL;DR: A minimum spanning tree (MST) is explained, a unique acyclic subgraph that connects all nodes and maximizes a property of interest such as synchronization between brain areas and how this may simplify the construction of simple generative models of normal and abnormal brain network organization.
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The minimum spanning tree: An unbiased method for brain network analysis

TL;DR: It is demonstrated that the MST is insensitive to alterations in connection strength or link density, and the behavior of MST and conventional network-characteristics for simulated regular and scale-free networks that were gradually rewired to random networks were explored.
Journal ArticleDOI

Seizure prediction - ready for a new era

TL;DR: Advances over the past decade that have set the stage for a resurgence in attempts to predict seizures in epilepsy are considered, and new avenues of investigation that combine mechanisms, models, data, devices and algorithms are proposed.
References
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Journal ArticleDOI

Collective dynamics of small-world networks

TL;DR: Simple models of networks that can be tuned through this middle ground: regular networks ‘rewired’ to introduce increasing amounts of disorder are explored, finding that these systems can be highly clustered, like regular lattices, yet have small characteristic path lengths, like random graphs.
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Complex brain networks: graph theoretical analysis of structural and functional systems

TL;DR: This article reviews studies investigating complex brain networks in diverse experimental modalities and provides an accessible introduction to the basic principles of graph theory and highlights the technical challenges and key questions to be addressed by future developments in this rapidly moving field.
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Complex network measures of brain connectivity: uses and interpretations.

TL;DR: Construction of brain networks from connectivity data is discussed and the most commonly used network measures of structural and functional connectivity are described, which variously detect functional integration and segregation, quantify centrality of individual brain regions or pathways, and test resilience of networks to insult.
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Spontaneous fluctuations in brain activity observed with functional magnetic resonance imaging.

TL;DR: Recent studies examining spontaneous fluctuations in the blood oxygen level dependent (BOLD) signal of functional magnetic resonance imaging as a potentially important and revealing manifestation of spontaneous neuronal activity are reviewed.
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The brainweb: phase synchronization and large-scale integration.

TL;DR: It is argued that the most plausible candidate is the formation of dynamic links mediated by synchrony over multiple frequency bands.
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