How important is the seizure onset zone for seizure dynamics?

TL;DR

This study investigates the role of different brain network nodes in seizure dynamics using intracranial EEG data, revealing that regions outside the seizure onset zone often play a more crucial role than the onset zone itself.

Contribution

It introduces a time-resolved network analysis approach to assess node importance in seizure evolution, highlighting the significance of non-onset zone regions.

Findings

Nodes outside the SOZ are often more important for seizure dynamics.

High variability in node importance over time and between individuals.

Network analysis can identify potential targets for personalized epilepsy treatment.

Abstract

Purpose: Research into epileptic networks has recently allowed deeper insights into the epileptic process. Here we investigated the importance of individual network nodes for seizure dynamics. Methods: We analysed intracranial electroencephalographic recordings of 86 focal seizures with different anatomical onset locations. With time-resolved correlation analyses, we derived a sequence of weighted epileptic networks spanning the pre-ictal, ictal, and post-ictal period, and each recording site represents a network node. We assessed node importance with commonly used centrality indices that take into account different network properties. Results: A high variability of temporal evolution of node importance was observed, both intra- and interindividually. Nevertheless, nodes near and far off the seizure onset zone (SOZ) were rated as most important for seizure dynamics more often (65% of cases) than nodes from within the SOZ (35% of cases). Conclusion: Our findings underline the high relevance of brain outside of the SOZ but within the large-scale epileptic network for seizure dynamics. Knowledge about these network constituents may elucidate targets for individualised therapeutic interventions that aim at preventing seizure generation and spread.