Sustained Aftereffect of α-tACS Lasts Up to 70 min after Stimulation

Transcranial alternating current stimulation (tACS) has been repeatedly demonstrated to increase power of endogenous brain oscillations in the range of the stimulated frequency after stimulation. In the alpha band this aftereffect has been shown to persist for at least 30 min. However, in most exper...

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Vydané v:Frontiers in human neuroscience Ročník 10; s. 245
Hlavní autori: Kasten, Florian H., Dowsett, James, Herrmann, Christoph S.
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Switzerland Frontiers Research Foundation 25.05.2016
Frontiers Media S.A
Predmet:
EEG
Electroencephalography
Experiments
Mental disorders
Neuroscience
Oscillations
Physiology
Studies
Vigilance
Visual stimuli
Germany
transcranial alternating current stimulation (tACS)
transcranial electrical stimulation (TES)
aftereffect
EEG
alpha oscillations
ISSN:1662-5161, 1662-5161
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Shrnutí:Transcranial alternating current stimulation (tACS) has been repeatedly demonstrated to increase power of endogenous brain oscillations in the range of the stimulated frequency after stimulation. In the alpha band this aftereffect has been shown to persist for at least 30 min. However, in most experiments the aftereffect exceeded the duration of the measurement. Thus, it remains unclear how the effect develops beyond these 30 min and when it decays. The current study aimed to extend existing findings by monitoring the physiological aftereffect of tACS in the alpha range for an extended period of 90 min post-stimulation. To this end participants received either 20 min of tACS or sham stimulation with intensities below their individual sensation threshold at the individual alpha frequency (IAF). Electroencephalogram (EEG) was acquired during 3 min before and 90 min after stimulation. Subjects performed a visual vigilance task during the whole measurement. While the enhanced power in the individual alpha band did not return back to pre-stimulation baseline in the stimulation group, the difference between stimulation and sham diminishes after 70 min due to a natural alpha increase of the sham group.
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Reviewed by: Tamer Demiralp, Istanbul University, Turkey; Giancarlo Zito, National Research Council and S. Giovanni Calibita Fatebenefratelli Hospital, Italy
Edited by: Lutz Jäncke, University of Zurich, Switzerland
ISSN:1662-5161
1662-5161
DOI:10.3389/fnhum.2016.00245