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Verfasst von:Kottlow, Mara [VerfasserIn]   i
 Brandeis, Daniel [VerfasserIn]   i
Titel:Pre-stimulus BOLD-network activation modulates EEG spectral activity during working memory retention
Verf.angabe:Mara Kottlow, Anthony Schlaepfer, Anja Baenninger, Lars Michels, Daniel Brandeis and Thomas Koenig
E-Jahr:2015
Jahr:06 May 2015
Umfang:11 S.
Fussnoten:Gesehen am 07.12.2017
Titel Quelle:Enthalten in: Frontiers in behavioral neuroscience
Ort Quelle:Lausanne : Frontiers Research Foundation, 2007
Jahr Quelle:2015
Band/Heft Quelle:9(2015) Artikel-Nummer 111, 11 Seiten
ISSN Quelle:1662-5153
Abstract:Working memory (WM) processes depend on our momentary mental state and therefore exhibit considerable fluctuations. Here, we investigate the interplay of task-preparatory and task-related brain activity as represented by pre-stimulus BOLD-fluctuations and spectral EEG from the retention periods of a visual WM task. Visual WM is used to maintain sensory information in the brain enabling the performance of cognitive operations and is associated with mental health. We tested 22 subjects simultaneously with EEG and fMRI while performing a visuo-verbal Sternberg task with two different loads, allowing for the temporal separation of preparation, encoding, retention and retrieval periods. Four temporally coherent networks - the default mode network (DMN), the dorsal attention, the right and the left WM network - were extracted from the continuous BOLD data by means of a group ICA. Subsequently, the modulatory effect of these networks’ pre-stimulus activation upon retention-related EEG activity in the theta, alpha and beta frequencies was analyzed. The obtained results are informative in the context of state-dependent information processing. We were able to replicate two well-known load-dependent effects: the frontal-midline theta increase during the task and the decrease of pre-stimulus DMN activity. As our main finding, these two measures seem to depend on each other as the significant negative correlations at frontal-midline channels suggested. Thus, suppressed pre-stimulus DMN levels facilitated later task related frontal midline theta increases. In general, based on previous findings that neuronal coupling in different frequency bands may underlie distinct functions in WM retention, our results suggest that processes reflected by spectral oscillations during retention seem not only to be “online” synchronized with activity in different attention-related networks but are also modulated by activity in these networks during preparation intervals.
DOI:doi:10.3389/fnbeh.2015.00111
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

kostenfrei: Volltext: http://dx.doi.org/10.3389/fnbeh.2015.00111
 kostenfrei: Volltext: https://www.frontiersin.org/articles/10.3389/fnbeh.2015.00111/full
 DOI: https://doi.org/10.3389/fnbeh.2015.00111
Datenträger:Online-Ressource
Sprache:eng
Sach-SW:BOLD-ICA
 covariance mapping
 frontal-midline theta
 pre-stimulus state
 state dependency
 temporally coherent brain networks
 working memory
K10plus-PPN:1566124549
Verknüpfungen:→ Zeitschrift

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