Publication details

Changes in Connectivity and Local Synchrony after Cognitive Stimulation - Intracerebral EEG Study

Authors

KLIMEŠ Petr JURÁK Pavel HALÁMEK Josef ROMAN Robert CHLÁDEK Jan BRÁZDIL Milan

Year of publication 2018
Type Article in Periodical
Magazine / Source Biomedical Signal Processing and Control
MU Faculty or unit

Faculty of Medicine

Citation
Doi http://dx.doi.org/10.1016/j.bspc.2018.05.043
Keywords Local field potential; Connectivity; Power; Correlation; Intracerebral EEG
Description Electroencephalographic studies utilize event-related power decrease/increase in order to analyze changes of neuronal activity in a single EEG channel during cognitive tasks. Other analytical approaches draw on bivariate methods which evaluate connectivity between two EEG channels. Despite the fact that spatial mapping of combined results of power and connectivity analyses may be used to study the dynamics of neuronal activation patterns, they are normally evaluated separately as different phenomena. Here we show the evaluation of dynamic changes in linear correlation after cognitive stimulation together with changes in power levels in the same channel pairs. Our results demonstrate the temporal evolution of synchronization patterns across the whole brain with a focus on the anatomical structure of the hippocampus. We observed a pattern of local and distant synchrony during cognitive processing, occurring 500 ms after stimulus onset in approximately 1% of all channel pairs. We hypothesize that evaluation of changes in connectivity, together with dynamic changes in power levels, can help identify dominant structures in the process of mental activity after a certain type of cognitive task. This can possibly lead to better understanding of synchronization processes at the neuronal and systemic level.
Related projects: