A Discussion of tACS Literature
State-dependent effects of transcranial oscillatory currents on the motor system during action observation.
Fuerra, Matteo, Evgeny Blagovechtchenski, Vadim V. Nikulin, Maria Nazarova, Anna Lebedeva, Daria Pozdeeva, Maria Yurevich, & Simone Rossi. 2019. State-dependent effects of transcranial oscillatory currents on the motor system during action observation. Scientific Reports. 9: 12858.
Summary: This study addresses the question the causal role of specific frequencies in action observation--a cognitive domain which engages the premotor motor cortex and facilitates TMS-induced MEPs. Using a range of tACS protocols (5, 10, 20, & 40 Hz) and an active sham condition, the investigators measured MEPs from the first dorsal interosseus (FDI) and the abductor digiti minimi (ADM) during stimulation under conditions of rest and observation of a hand making a pinching movement (i.e., activating the FDI). TACS delivered at 20 Hz induced a non-selective facilitation of MEPs in both muscles at rest, whereas 10 Hz and 40 Hz tACS only facilitated MEPs in the FDI during movement observation suggesting these frequencies play a role in movement planning and execution.
Contributed by: Christopher Walker, PhD
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Every week, there are new and exciting scientific papers published on studies that investigated tACS. Reading and understanding these papers unfortunately requires both access to (sometimes quite expensive) scientific journals and in-depth "insider knowledge." Our goal is to share with you brief summaries of tACS studies that give you a big-picture idea of what the publications are about. There are too many studies to feature all of them but we will continuously update this page. If you have a specific study you would like to get featured, please contact us. The contributors are personnel from the Frohlich Lab and the Carolina Center for Neurostimulation.