Open AccessBeta 2-band synchronization during a visual oddball task
Author(s) -
Miloslav Kukleta,
Petr Bob,
Milan Brázdil,
Róbert Román,
Ivan Rektor
Publication year - 2009
Publication title -
physiological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.647
H-Index - 70
eISSN - 1802-9973
pISSN - 0862-8408
DOI - 10.33549/physiolres.931629
Subject(s) - oddball paradigm , stimulus (psychology) , correlation , audiology , electroencephalography , correlation coefficient , spearman's rank correlation coefficient , psychology , mathematics , beta (programming language) , neuroscience , physics , medicine , statistics , event related potential , cognitive psychology , computer science , geometry , programming language
The study investigated whether specific changes in phasesynchrony in the beta 2 frequency band of EEG (25-35 Hz)occurred during a recognition task. The level of synchrony wasexamined between one hundred and eighty loci in the frontal andtemporal lobes of eight epileptic patients with intracerebralelectrodes; the EEG records were obtained during a visualoddball task. In each pair of records, the correlation curves werecreated from the sequence of correlation coefficients calculated.These curves consisted of irregular oscillations between themaximal and minimal r-values. Transient highly synchronizedactivity was observed during the whole time course of theexperiment in all record pairs investigated and a significantrelationship was found between the number of such episodesand the mean correlation coefficient (Spearman R 0.84; N 3240;p<0.001). On averaged curves, which were calculated usingstimulus onsets as the trigger of averaging, a significant increaseof the mean correlation coefficient in the post-stimulus epochwas found (p<0.01 after both target and non-target stimuli;t-test for dependent samples). As the cognitive demandsignificantly increases after stimulus presentation, the results areconsidered to be the first evidence from intracranial recording ofincreased synchronization in the beta 2 frequency band related tothe cognitive activity.