Jiri Janecek, Jan Chladek, Josef Halamek, Pavel Jurak, Milan Brazdil
Repetitive EEG, coupling, signal processing, correlation,statistical analysis.
Functional integration refers to the interactions among multiple specialized neuronal populations. Here a method of time evolution of couplings in the repetitive EEG event-related signals recorded by intracerebral electrodes has been assessed. To this end, transient changes in the correlation of EEG signals in the post-stimuli period (i.e. tightly time-locked to a repetitively administered stimulus) were analyzed. A huge number of correlation pairs of 10 subjects (over 40,000 in total) was inspected. In this way a proper method of result visualization in a form of matrixes was determined. Our results show that there are observable and statistically significant changes to the correlation in the post-stimuli period in comparison to the interval before stimuli, when inactivity is supposed.
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