Functions and sources of event-related EEG alpha oscillations studied with the Wavelet Transform

1999 ◽  
Vol 110 (4) ◽  
pp. 643-654 ◽  
Author(s):  
R Quian Quiroga ◽  
M Schürmann
2020 ◽  
Author(s):  
Aleksandra Kołodziej ◽  
Mikołaj Magnuski ◽  
Anastasia Ruban ◽  
Aneta Brzezicka

AbstractFor decades, the frontal alpha asymmetry (FAA) - a disproportion in EEG alpha oscillations power between right and left frontal channels - has been one of the most popular measures of depressive disorders (DD) in electrophysiology studies. Patients with DD often manifest a left-sided FAA: relatively higher alpha power in the left versus right frontal lobe. Recently, however, multiple studies failed to confirm this effect, questioning its reproducibility. Our purpose is to thoroughly test the validity of FAA in depression by conducting a multiverse analysis - running many related analyses and testing the sensitivity of the effect to changes in the analytical approach - on data from three independent studies. Only two of the 81 analyses revealed significant results. We conclude the paper by discussing theoretical assumptions underlying the FAA and suggest a list of guidelines for improving and expanding the EEG data analysis in future FAA studies.


2021 ◽  
Author(s):  
Kevin J. Clancy ◽  
Jeremy A. Andrzejewski ◽  
Jens T. Rosenberg ◽  
Mingzhou Ding ◽  
Wen Li

The default mode network (DMN) is the most prominent intrinsic connectivity network, serving as a key architecture of the brain's functional organization. Conversely, dysregulation of the DMN is characteristic of major neuropsychiatric disorders. However, the field still lacks mechanistic insights into the regulation of the DMN and effective interventions for DMN dysregulation. The current study approached this problem by manipulating neural synchrony, particularly, alpha (8-12 Hz) oscillations, a dominant intrinsic oscillatory activity that has been increasingly associated with the DMN in both function and physiology. Using high-definition (HD) alpha-frequency transcranial alternating current stimulation (α-tACS) to stimulate the cortical source of alpha oscillations, in combination with simultaneous EEG-fMRI, we demonstrated that α-tACS (vs. sham control) not only augmented EEG alpha oscillations but also strengthened fMRI and (source-level) alpha connectivity within the core of the DMN. Importantly, increase in alpha oscillations mediated the DMN connectivity enhancement. These findings thus identify a mechanistic link between alpha oscillations and DMN functioning. That transcranial alpha modulation can upregulate the DMN further highlights an effective non-invasive intervention to normalize DMN functioning in various disorders.


NeuroImage ◽  
2015 ◽  
Vol 113 ◽  
pp. 153-163 ◽  
Author(s):  
Jennifer M. Walz ◽  
Robin I. Goldman ◽  
Michael Carapezza ◽  
Jordan Muraskin ◽  
Truman R. Brown ◽  
...  

Neuroreport ◽  
2002 ◽  
Vol 13 (5) ◽  
pp. 681-684 ◽  
Author(s):  
Edwin Verstraeten ◽  
Raymond Cluydts

NeuroImage ◽  
2014 ◽  
Vol 103 ◽  
pp. 444-453 ◽  
Author(s):  
Rikkert Hindriks ◽  
Michel J.A.M. van Putten ◽  
Gustavo Deco
Keyword(s):  

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