Changes in connectivity and local synchrony after cognitive stimulation Intracerebral EEG study

0493420 - ÚPT 2019 RIV NL eng J - Článek v odborném periodiku
Klimeš, Petr - Jurák, Pavel - Halámek, Josef - Roman, R. - Chládek, Jan - Brázdil, M.
Changes in connectivity and local synchrony after cognitive stimulation Intracerebral EEG study.
Biomedical Signal Processing and Control. Roč. 45, AUG (2018), s. 136-143. ISSN 1746-8094. E-ISSN 1746-8108
Grant CEP: GA MŠMT(CZ) LO1212; GA MŠMT ED0017/01/01; GA MZd(CZ) NV16-33798A
Institucionální podpora: RVO:68081731
Klíčová slova: local field potential * connectivity * power * correlation * intracerebral EEG
Obor OECD: Neurosciences (including psychophysiology
Impakt faktor: 2.943, rok: 2018

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.
Trvalý link: http://hdl.handle.net/11104/0286796