Abstract：
BACKGROUND:The presence of spikes and sharp waves in recordings of epileptic patients contaminates background signal synchronization. When estimating functional connectivity between extended cortical areas, the influence of epileptic spikes in specific areas should be considered; however, this step is sometimes overlooked. We present a simple method for quantifying the influence of epileptic activity on background signal synchronization. METHOD:Standard synchronization measures were calculated for both pure correlated Gaussian signals and correlated Gaussian signals with different levels of epileptic spikes in order to determine the influence of epileptic activity on synchronization estimates. RESULTS:Synchronization from invasive epileptic recordings (e.g., depth electrodes) displays a much higher bias due to epileptic activity than superficial electrodes. Moreover, statistical methods such as mutual information are more affected by spike presence than phase synchronization methods. The influence of spikes is far greater at low values of background synchronization. CONCLUSIONS:The information provided by this procedure makes it possible to differentiate true background synchronization from spike synchronization. Thus, our procedure serves as a guide for analyzing synchronization and functional connectivity calculations in epileptic recordings.
journal_name
J Neurosci Methodsjournal_title
Journal of neuroscience methodsauthors
Pastor J,Sola RG,Ortega GJdoi
10.1016/j.jneumeth.2013.11.027subject
Has Abstractpub_date
2014-02-15 00:00:00pages
69-73eissn
0165-0270issn
1872-678Xpii
S0165-0270(13)00416-0journal_volume
223pub_type
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