Neural cross-talk during discrimination of odds
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1
Behavioral and Social Neuroscience Research Group, Central European Institute of Technology, Masaryk University, Czechia
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2
Brno Epilepsy Center, Department of Neurology, St. Anne’s University Hospital and Medical Faculty of Masaryk University, Czechia
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3
Institute of Scientific Instruments, Academy of Sciences of the Czech Republic, Czechia
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4
Department of Physiology, Medical Faculty of Masaryk University, Czechia
During cognitive tasks brain regions communicate with each other. This cross-talk among the multiple specialized neuronal populations seems to be fundamental for successful information processing. To investigate inter-areal interactions we computed time evolution of cross-correlations in pairs of human depth EEG signals during simple discrimination task. Ten drug-resistant epileptic patients undergoing depth electrode recordings participated in the study. A visual oddball task was completed by the subjects. Simultaneously intracerebral macro-EEG signals were collected from a total of 898 brain sites over subjects. In each subject, the time evolution of cross-correlations in 1,275-6,441 contact pairs were examined in six frequency ranges (δ, θ, α, β, lower γ /20-45 Hz/, and upper γ /55-95 Hz/) and the post-stimulus changes were evaluated. In five of the six examined frequency ranges the cross-correlations increased (and in four decreased) after targets significantly more often than after frequents. The most prominent changes we found in δ and upper γ ranges – in the delta range an increase of cross-correlations after targets prevailed, whilst predominant decrease of cross-correlations was observed in the upper gamma range. When examining timing of global cross-correlation changes we found significant differences among frequency bands, with the first change (mainly increase) in the lower ranges, promptly accompanied by decoupling in the upper gamma, and final coupling within β activities. To summarize: In a parallel way distinct neural assemblies communicate with each other at different frequencies. In addition, there seems to be specific timing of phase synchrony/desynchrony for separate frequencies, suggesting dissimilar functional significance for distinct frequencies.
Keywords:
Cognition,
EEG
Conference:
XI International Conference on Cognitive Neuroscience (ICON XI), Palma, Mallorca, Spain, 25 Sep - 29 Sep, 2011.
Presentation Type:
Poster Presentation
Topic:
Poster Sessions: Neurophysiology of Cognition and Attention
Citation:
Brázdil
M,
Janeček
J,
Roman
R,
Jurák
P,
Chládek
J,
Daniel
P,
Mareček
R,
Rektor
I and
Halámek
J
(2011). Neural cross-talk during discrimination of odds.
Conference Abstract:
XI International Conference on Cognitive Neuroscience (ICON XI).
doi: 10.3389/conf.fnhum.2011.207.00304
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Received:
22 Nov 2011;
Published Online:
28 Nov 2011.
*
Correspondence:
Dr. Milan Brázdil, Behavioral and Social Neuroscience Research Group, Central European Institute of Technology, Masaryk University, Brno, Czechia, karolina.holubova@hrgworldwide.com