Orchestrating neuronal networks: sustained after-effects of transcranial alternating current stimulation depend upon brain states

The interest in transcranial alternating current stimulation (tACS) has significantly increased in the past decade. It has potential to modulate brain oscillations in a frequency specific manner, offering the possibility to demonstrate a causal nature of oscillation behavior relationships. TACS is a...

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Vydáno v:Frontiers in human neuroscience Ročník 7; s. 161
Hlavní autoři: Neuling, Toralf, Rach, Stefan, Herrmann, Christoph S.
Médium: Journal Article
Jazyk:angličtina
Vydáno: Switzerland Frontiers Research Foundation 2013
Frontiers Media S.A
Témata:
alpha
Brain
Brain State
EEG
Electric fields
Electroencephalography
Experiments
Mental disorders
Neural networks
Neuroscience
Oscillations
Rhythm
Rhythms
TACs
Therapeutic applications
transcranial alternating current stimulation
Vigilance
New York
Germany
tACS
brain state
transcranial alternating current stimulation
EEG
alpha
ISSN:1662-5161, 1662-5161
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Shrnutí:The interest in transcranial alternating current stimulation (tACS) has significantly increased in the past decade. It has potential to modulate brain oscillations in a frequency specific manner, offering the possibility to demonstrate a causal nature of oscillation behavior relationships. TACS is a strong candidate as a tool for clinical applications, however, to fulfill this potential, certain parameters have yet to be evaluated. First, little is known about long-lasting after-effects of tACS with respect to the modulations of rhythmic brain activity. Second, the power of endogenous brain oscillations might play a crucial role in the efficacy of tACS. We hypothesize that the after-effects of tACS depend on the endogenous power of oscillations. To this end, we modulated the power of endogenous occipital alpha oscillations via tACS. In two experiments, participants either had their eyes open or closed to keep endogenous alpha power either low or high while they were stimulated for 20 min with their individual alpha frequency (IAF) and simultaneously performing a vigilance task. After-effects on IAF power were evaluated over a course of 30 min with a pre stimulation period serving as baseline. After-effects were strongly dependent on IAF power. Enhanced IAF power was observed for at least 30 min after tACS under conditions of low endogenous IAF power, whereas, IAF power could not be further enhanced by tACS under conditions of high IAF power. The current study demonstrates, for the first time, a long lasting effect after tACS on endogenous EEG power in the range of the stimulation frequency. Additionally, we present conclusive evidence that the power of the endogenous oscillations has a critical impact on tACS efficacy. Long lasting after-effects foster the role of tACS as a tool for non-invasive brain stimulation and demonstrate the potential for therapeutic application to reestablish the balance of altered brain oscillations.
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Reviewed by: Caspar M. Schwiedrzik, The Rockefeller University, USA; Manuela Ruzzoli, Pompeu Fabra University, Spain
Edited by: Carlo Miniussi, University of Brescia, Italy
ISSN:1662-5161
1662-5161
DOI:10.3389/fnhum.2013.00161