Facilitated Event-Related Power Modulations during Transcranial Alternating Current Stimulation (tACS) Revealed by Concurrent tACS-MEG
By A Mystery Man Writer
Last updated 17 Jun 2024
Non-invasive approaches to modulate oscillatory activity in the brain are increasingly popular in the scientific community. Transcranial alternating current stimulation (tACS) has been shown to modulate neural oscillations in a frequency-specific manner. However, due to a massive stimulation artifact at the targeted frequency, little is known about effects of tACS during stimulation. It remains unclear how the continuous application of tACS affects event-related oscillations during cognitive tasks. Depending on whether tACS influences pre- or post-stimulus oscillations, or both, the endogenous, event-related oscillatory dynamics could be pushed in various directions or not at all. A better understanding of these effects is crucial to plan, predict, and understand outcomes of solely behavioral tACS experiments. In the present study, a recently proposed procedure to suppress tACS artifacts by projecting MEG data into source-space using spatial filtering was utilized to recover event-related power modulations in the alpha-band during a mental rotation task. MEG data of 25 human subjects was continuously recorded. After 10-minute baseline measurement, participants received either 20 minutes of tACS at their individual alpha frequency or sham stimulation. Another 40 minutes of MEG data were acquired thereafter. Data were projected into source-space and carefully examined for residual artifacts. Results revealed strong facilitation of event-related power modulations in the alpha-band during tACS application. These results provide first direct evidence that tACS does not counteract top-down suppression of intrinsic oscillations, but rather enhances pre-existent power modulations within the range of the individual alpha (= stimulation) frequency.
Probing the Link Between Perception and Oscillations: Lessons from Transcranial Alternating Current Stimulation - Yuranny Cabral-Calderin, Melanie Wilke, 2020
Vision modulation, plasticity and restoration using non-invasive brain stimulation – An IFCN-sponsored review - ScienceDirect
The hidden state-dependency of transcranial alternating current stimulation (tACS)
PDF) Facilitated Event-Related Power-Modulations during Transcranial Alternating Current Stimulation (tACS) Revealed by Concurrent tACS-MEG
Transcranial Alternating Current Stimulation Attenuates Visual Motion Adaptation
Integrating electric field modeling and neuroimaging to explain inter-individual variability of tACS effects
Transcranial Alternating Current Stimulation - an overview
Online and offline effects of transcranial alternating current stimulation of the primary motor cortex
Brain Sciences, Free Full-Text
Transcranial Alternating Current Stimulation Attenuates Visual Motion Adaptation
Frontiers Signal-Space Projection Suppresses the tACS Artifact
Brain Sciences, Free Full-Text
Brain Sciences, Free Full-Text
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