Cognitive network interactions and beta 2 coherence in processing non-target stimuli in visual oddball task
Language English Country Czech Republic Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
PubMed
18198993
DOI
10.33549/physiolres.931404
PII: 1404
Knihovny.cz E-resources
- MeSH
- Beta Rhythm * MeSH
- Time Factors MeSH
- Adult MeSH
- Epilepsy physiopathology psychology MeSH
- Electrodes, Implanted MeSH
- Cognition * MeSH
- Cortical Synchronization MeSH
- Middle Aged MeSH
- Humans MeSH
- Brain Mapping instrumentation methods MeSH
- Cerebral Cortex physiopathology MeSH
- Nerve Net physiopathology MeSH
- Periodicity MeSH
- Photic Stimulation MeSH
- Signal Detection, Psychological * MeSH
- Visual Perception MeSH
- Visual Pathways physiopathology MeSH
- Evoked Potentials, Visual MeSH
- Check Tag
- Adult MeSH
- Middle Aged MeSH
- Humans MeSH
- Male MeSH
- Female MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
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.
References provided by Crossref.org
