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Abstract:

Objective: Following external stimulation, electroencephalographic (EEG) responses from different frequency bands occur simultaneously, but little is known about whether and how concurrent multi-frequency responses depend on each other during stimulus information processing. The present study assessed the effects of task stimulus relevance on locally co-existent time-frequency components of event-related brain potentials (ERPs). Methods: The wavelet entropy (WE) of ERPs was used as an analytical tool because low entropy values correspond to a narrow-band (mono-frequency) activity characterizing highly ordered (regularized) bioelectric states. The minimum of WE in the ERPs (WEmin) was identified to reflect a transient dominance of one particular frequency ERP component over other frequency components. In an auditory oddball condition, effects of stimulus relevance were analyzed for the timing, rate of decrease, and frequency determinants of WEmin in 10 subjects. Results: Major results demonstrate that a highly ordered EEG microstate emerged in response to both target and non-target stimuli, as evidenced by the substantial decrement of ERP entropy. This microstate (1) was short lasting as indexed by the transitory entropy decrease, (2) had a functionally specific time-localization as reflected by stimulus and electrode effects on WEmin latency, and (3) for both stimulus types was determined by a pronounced dominance of locally synchronized theta (4-8Hz) oscillations. Conclusions: These results reveal a new neuroelectric correlate of stimulus processing and suggest that a theta-dominated microstate in the ERP may reflect a basic processing stage of stimulus evaluation, during which interfering activations from other frequency networks are minimized. Significance: In the framework of event-related brain dynamics, this study provides evidence that during stimulus processing, there is an interaction of locally co-existent multiple frequency ERP components. It is characterized by a transitory dominance of synchronized theta oscillations over other frequency ERP components emerging irrespective of stimulus task relevance and frequency ERP content, which may reflect basic processing mechanisms. © 2003 Elsevier Science Ireland Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:A transient dominance of theta event-related brain potential component characterizes stimulus processing in an auditory oddball task
Autor:Yordanova, J.; Rosso, O.A.; Kolev, V.
Filiación:Institute of Physiology, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., bl. 23, 1113 Sofia, Bulgaria
Instituto de Calculo, Fac. de Ciencias Exactas y Naturales, Pabellon II, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Palabras clave:Brain microstates; Electroencephalography; Entropy; Event-related brain potentials; Multi-frequency oscillations; Time-frequency analysis; action potential; adult; article; auditory stimulation; controlled study; electrode; electroencephalogram; entropy; event related potential; female; frequency analysis; human; human experiment; latent period; male; normal human; priority journal; stimulus generalization; task performance; theta rhythm; time
Año:2003
Volumen:114
Número:3
Página de inicio:529
Página de fin:540
DOI: http://dx.doi.org/10.1016/S1388-2457(02)00415-7
Título revista:Clinical Neurophysiology
Título revista abreviado:Clin. Neurophysiol.
ISSN:13882457
CODEN:CNEUF
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_13882457_v114_n3_p529_Yordanova

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Citas:

---------- APA ----------
Yordanova, J., Rosso, O.A. & Kolev, V. (2003) . A transient dominance of theta event-related brain potential component characterizes stimulus processing in an auditory oddball task. Clinical Neurophysiology, 114(3), 529-540.
http://dx.doi.org/10.1016/S1388-2457(02)00415-7
---------- CHICAGO ----------
Yordanova, J., Rosso, O.A., Kolev, V. "A transient dominance of theta event-related brain potential component characterizes stimulus processing in an auditory oddball task" . Clinical Neurophysiology 114, no. 3 (2003) : 529-540.
http://dx.doi.org/10.1016/S1388-2457(02)00415-7
---------- MLA ----------
Yordanova, J., Rosso, O.A., Kolev, V. "A transient dominance of theta event-related brain potential component characterizes stimulus processing in an auditory oddball task" . Clinical Neurophysiology, vol. 114, no. 3, 2003, pp. 529-540.
http://dx.doi.org/10.1016/S1388-2457(02)00415-7
---------- VANCOUVER ----------
Yordanova, J., Rosso, O.A., Kolev, V. A transient dominance of theta event-related brain potential component characterizes stimulus processing in an auditory oddball task. Clin. Neurophysiol. 2003;114(3):529-540.
http://dx.doi.org/10.1016/S1388-2457(02)00415-7