Pre-stimulus BOLD-network activation modulates EEG spectral activity during working memory retention
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...
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| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
06 May 2015
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| In: |
Frontiers in behavioral neuroscience
Year: 2015, Jahrgang: 9 |
| ISSN: | 1662-5153 |
| DOI: | 10.3389/fnbeh.2015.00111 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.3389/fnbeh.2015.00111 Verlag, kostenfrei, Volltext: https://www.frontiersin.org/articles/10.3389/fnbeh.2015.00111/full 
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| Verfasserangaben: | Mara Kottlow, Anthony Schlaepfer, Anja Baenninger, Lars Michels, Daniel Brandeis and Thomas Koenig |
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| 245 | 1 | 0 | |a Pre-stimulus BOLD-network activation modulates EEG spectral activity during working memory retention |c Mara Kottlow, Anthony Schlaepfer, Anja Baenninger, Lars Michels, Daniel Brandeis and Thomas Koenig |
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| 520 | |a 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. | ||
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