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Mean relative changes of power at the four frequency bands of interest following 10 Hz, 20 Hz and sham tACS. Error bars indicate standard error of mean. Please note that a trend toward a significant main effect of factor stimulation was found on low gamma band power, only. Post-hoc analysis revealed that low gamma band power following 20 Hz tACS was significantly reduced as compared to sham stimulation and 10 Hz tACS.
