Changes of oscillatory activity during visual oddball task (SEEG study)
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1
Department of Physiology, Medical Faculty, Masaryk University, Czechia
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2
Department of Neurology, St. Anne Hospital, Masaryk University, Czechia
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3
Institute of Scientific Instruments, Academy of Sciences, Czechia
Objectives: To study intracerebral distribution and frequency spectrum of event-related desynchronization (ERD) and synchronization (ERS) recorded during discrimination task.
Methods: EEG was recorded from 187 cerebral sites in 6 patients suffering from intractable epilepsy during visual oddball task. Patients were instructed to respond only to the target stimulus by pressing the microswitch button. The intertrial variance method of quantification of ERD and ERS was used separately for target and frequent stimuli in individually selected reactive frequency bands (in the theta, alfa, beta and gamma range).
Results: ERD and ERS were observed both after target and frequent stimuli repeatedly in the amygdala, hippocampus, parahippocampal gyrus, cingulate gyrus, fusiform gyrus, rectus gyrus, orbitofrontal gyri, superior and middle temporal gyri, middle and inferior frontal gyri. ERD after target stimuli was found in 139 sites – 91 cases in alfa, 69 cases in theta, 86 cases in beta and 15 cases in gamma band. ERS was observed in 86 sites – 42 cases in alfa, 37 cases in theta, 42 cases in beta and 17 cases in gamma band. ERD after frequent stimuli was present in 53 sites – 21 cases in alfa, 9 cases in theta, 23 cases in beta and 5 cases in gamma band. ERS was found in 63 sites – 24 cases in alfa, 9 cases in theta, 39 cases in beta and 4 cases in gamma band.
Conclusion: Widespread distribution of decreased and increased oscillatory activity in different frequency bands shows the complexity of neural networks involved in cognitive processing of visual stimuli. More frequent finding of ERD phenomena after target stimuli might probably reflect the enhanced information processing related to the executive functions.
Conference:
10th International Conference on Cognitive Neuroscience, Bodrum, Türkiye, 1 Sep - 5 Sep, 2008.
Presentation Type:
Poster Presentation
Topic:
Brain Electrical Oscillations in Cognition
Citation:
Roman
R,
Brázdil
M,
Chládek
J,
Jurák
P,
Rektor
I and
Kukleta
M
(2008). Changes of oscillatory activity during visual oddball task (SEEG study).
Conference Abstract:
10th International Conference on Cognitive Neuroscience.
doi: 10.3389/conf.neuro.09.2009.01.141
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Received:
05 Dec 2008;
Published Online:
05 Dec 2008.
*
Correspondence:
Robert Roman, Department of Physiology, Medical Faculty, Masaryk University, Brno, Czechia, roman@med.muni.cz