Cognitive network interactions and beta 2 coherence in processing non-target stimuli in visual oddball task

Title:

Cognitive network interactions and beta 2 coherence in processing non-target stimuli in visual oddball task

Creator:

Miloslav Kukleta, Milan Brázdil, Robert Roman, Petr Bob, and Ivan Rektor

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:dcfc60b5-23ca-47bd-824d-1620249cc1d6
uuid:dcfc60b5-23ca-47bd-824d-1620249cc1d6

Subject:

Fyziologie člověka a srovnávací fyziologie, fyziologie, elektroencefalografie, physiology, electroencephalography, intra-cerebral EEG recording in humans, event-related potential, oddball task, beta coherence, binding in cognition, 14, and 612

Type:

article, články, model:article, and TEXT

Format:

print

Description:

Spatiotemporal dynamics of event-related potentials (ERP) evoked by non-target stimuli in a visual oddball experiment and the presence of coherent oscillations in beta 2 frequency band of decomposed EEG records from peristimulus period were investigated by means of intracranial electrodes in humans. Twenty-one patients with medically intractable epilepsy participated in the study. The EEG signal was recorded using platinum electrodes implanted in several cortical and subcortical sites. Averaged 2 s EEG records were analyzed. Task-specific EEG changes were found in each patient, ERPs were derived from 92 electrodes used (96 % of possible cases). In the majority of analysed cases, ERPs were composed of several distinct components, and their duration was mostly longer than 1 s. The mean onset of the first ERP component was 158±132 ms after the stimulus (median 112 ms, minimum value 42 ms, maximum value 755 ms), and large variability of these onset times was found in all the investigated structures. Possible coherence between neural activities of remote brain sites was investigated by calculating running correlations between pairs of decomposed EEG records (alpha, beta 1, beta 2 frequency bands were used, total number of correlated pairs was 662 in each frequency band). The record pairs exhibiting highly correlated time segments represented 23 % of all the investigated pairs in alpha band, 7 % in beta 1 band, and 59 % in beta 2 band. In investigated 2 s record windows, such segments were distributed evenly, i.e. they were also found before the stimulus onset. In conclusion, the results have implicated the idea that a lot of recorded ERPs was more or less by-products of chance in spreading a signal within the neuronal network, and that their functional relevance was somewhat linked with the phenomenon of activity synchronization., M. Kukleta ... [et al.]., and Obsahuje seznam literatury

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Source:

Physiological research | 2009 Volume:58 | Number:1

Harvested from:

CDK

Metadata only:

false