A Discussion of tACS Literature
Effects of theta transcranial alternating current stimulation over the frontal cortex on reversal learning
Wischnewski, Miles, Paul Zerr, and Dennis JLG Schutter. 2016. 'Effects of theta transcranial alternating current stimulation over the frontal cortex on reversal learning', Brain stimulation, 9: 705-11.
Summary: Theta oscillations are generated after notification of a reward or loss in reinforcement learning paradigms. Wischnewski et al., delivered theta-frequency transcranial alternating current stimulation (tACS) bifrontally during performance of a reward-based reinforcement learning task. Participants that receive theta-tACS were quicker to learn that a decision was less rewarding and quicker to re-learn its value when it was re-instated as rewarding. EEG results revealed that theta-tACS decreased theta oscillations (and theta-beta ratio) as measured by rest after versus before the task. These results provide causal evidence for theta oscillations in reward learning.
Contributed by: Justin Riddle, 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.