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Background: The study investigates oscillatory brain activity during working memory (WM) tasks. The tasks employed varied in two dimensions. First, they differed in complexity from average to highly demanding. Second, we used two types of tasks, which required either only retention of stimulus set or retention and manipulation of the content. We expected to reveal EEG correlates of temporary storage and central executive components of WM and to assess their contribution to individual differences.
Results: Generally, as compared with the retention condition, manipulation of stimuli in WM was associated with distributed suppression of alpha1 activity and with the increase of the midline theta activity. Load and task dependent decrement of beta1 power was found during task performance. Beta2 power increased with the increasing WM load and did not significantly depend on the type of the task. At the level of individual differences, we found that the high performance (HP) group was characterized by higher alpha rhythm power. The HP group demonstrated task-related increment of theta power in the left anterior area and a gradual increase of theta power at midline area. In contrast, the low performance (LP) group exhibited a drop of theta power in the most challenging condition. HP group was also characterized by stronger desynchronization of beta1 rhythm over the left posterior area in the manipulation condition. In this condition, beta2 power increased in the HP group over anterior areas, but in the LP group over posterior areas.
Conclusions: WM performance is accompanied by changes in EEG in a broad frequency range from theta to higher beta bands. The most pronounced differences in oscillatory activity between individuals with high and low WM performance can be observed in the most challenging WM task.
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http://dx.doi.org/10.1186/s12868-017-0344-5 | DOI Listing |
Curr Biol
March 2025
Institute of Neuroscience, Key Laboratory of Brain Cognition and Brain-Inspired Intelligence Technology, CAS Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai 200031, China; Shanghai Academy of Natural Sciences (SANS), Fudan University, Shanghai 200031, China. Electronic address:
To process sequential streams of information, e.g., language, the brain must encode multiple items in sequence working memory (SWM) according to their ordinal relationship.
View Article and Find Full Text PDFJ Cogn Neurosci
March 2025
Reichman University, Herzliya, Israel.
This study investigates the role of theta frequency transcranial alternating current stimulation (tACS) in enhancing the consolidation of newly acquired semantic knowledge. Although postencoding theta oscillatory power increase has been reported to benefit episodic memory consolidation, its influence on semantic memory retention has not been examined. In this experiment, 175 participants were taught fundamental immunology concepts and were then randomly assigned to receive either theta or beta tACS, applied through midline frontal, left parietal, or bilateral parietal montages, or sham stimulation as a passive control condition.
View Article and Find Full Text PDFBrain Behav
March 2025
Department of Clinical Neuroscience, University of Geneva, Geneva, Switzerland.
Unlabelled: Schizophrenia is a complex disorder characterized by altered brain functional connectivity, detectable during both task and resting state conditions using different neuroimaging methods. To this day, electroencephalography (EEG) studies have reported inconsistent results, showing both hyper- and hypo-connectivity with diverse topographical distributions. Interpretation of these findings is complicated by volume-conduction effects, where local brain activity fluctuations project simultaneously to distant scalp regions (zero-phase lag), inducing spurious inter-electrode correlations.
View Article and Find Full Text PDFBiomed Eng Online
March 2025
KITE Toronto Rehabilitation Institute, University Health Network, 550 University Avenue 11th Floor, Rm 11-183, Toronto, ON, M5G 2A2, Canada.
Background: With the explosion of techniques for recording electrical brain activity, our recognition of neurodiversity has expanded significantly. Yet, uncertainty exists regarding sex differences in electrical activity during sleep and whether these differences, if any, are associated with social parameters. We synthesised existing evidence applying the PROGRESS-Plus framework, which captures social parameters that may influence brain activity and function.
View Article and Find Full Text PDFJ Biomed Sci
March 2025
GIGA-Institute, CRC-Human Imaging, University of Liège, Bâtiment B30, 8 Allée du Six Août, Sart Tilman, 4000, Liège, Belgium.
Background: Animal studies established that the locus coeruleus (LC) plays important roles in sleep and wakefulness regulation. Whether it contributes to sleep variability in humans is not yet established. Here, we investigated if the in vivo activity of the LC is related to the variability in the quality of Rapid Eye Movement (REM) sleep.
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