Standing waves as an explanation for generic stationary correlation patterns in noninvasive EEG of focal onset seizures.

Müller, Markus Franziskus; Rummel, Christian; Goodfellow, Marc; Schindler, Kaspar Anton (2014). Standing waves as an explanation for generic stationary correlation patterns in noninvasive EEG of focal onset seizures. Brain connectivity, 4(2), pp. 131-144. Mary Ann Liebert 10.1089/brain.2013.0192

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Text Mueller_brain.2013.0192.pdf - Published Version Available under License Publisher holds Copyright. This is a copy of an article published in Brain Connectivity © 2014 [copyright Mary Ann Liebert, Inc.]; Brain Connectivity is available online at: http://online.liebertpub.com. Download (1MB) | Preview

Cerebral electrical activity is highly nonstationary because the brain reacts to ever changing external stimuli and continuously monitors internal control circuits. However, a large amount of energy is spent to maintain remarkably stationary activity patterns and functional inter-relations between different brain regions. Here we examine linear EEG correlations in the peri-ictal transition of focal onset seizures, which are typically understood to be manifestations of dramatically changing inter-relations. Contrary to expectations we find stable correlation patterns with a high similarity across different patients and different frequency bands. This skeleton of spatial correlations may be interpreted as a signature of standing waves of electrical brain activity constituting a dynamical ground state. Such a state could promote the formation of spatiotemporal neuronal assemblies and may be important for the integration of information stemming from different local circuits of the functional brain network.

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