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• W2807129808 abstract "tACS has found widespread use as a basic tool in the exploration of the role of brain oscillations. Many studies have shown that frequency-specific tACS is able to not only alter cognitive processes during stimulation, but also cause specific physiological aftereffects visible in the EEG. The relationship between the emergence of these aftereffects and the necessary duration of stimulation is inconclusive. Our goal in this study was to narrow down the crucial length of tACS-blocks, by which aftereffects can be elicited. We stimulated participants with α-tACS in four blocks of 1-min, 3-min, 5-min, and 10-min length, once in increasing and once in decreasing order. After each block, we measured the resting EEG for 10 minutes during a visual vigilance task. We could not find lasting enhancement of α-power following any stimulation block, when comparing the stimulated groups to the sham group. These findings offer no information regarding the crucial stimulation duration. In addition, this is in conflict with previous findings, showing a power increase following 10 min of tACS in the alpha range. We performed additional explorative analyses, based on known confounds of (1) mismatches between stimulation frequency and individual alpha frequency and (2) abnormalities in baseline α-activity. The results of an ANOCOVA suggested that both factor explain variance, but could not resolve how exactly both factors interfere with the stimulation effect. Employing a linear mixed model, we found a significant effect of stimulation following 10 min of α-tACS in the increasing sequence and a significant effect of the mismatch between stimulated frequency and individual alpha frequency. The implications of these findings for future research are discussed." @default.
• W2807129808 created "2018-06-13" @default.
• W2807129808 creator A5054382698 @default.
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• W2807129808 date "2018-06-20" @default.
• W2807129808 modified "2023-10-17" @default.
• W2807129808 title "Absence of Alpha-tACS Aftereffects in Darkness Reveals Importance of Taking Derivations of Stimulation Frequency and Individual Alpha Variability Into Account" @default.
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• W2807129808 doi "https://doi.org/10.3389/fpsyg.2018.00984" @default.
• W2807129808 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6157486" @default.
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