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. 2021 Jul 8;15:628229. doi: 10.3389/fnhum.2021.628229

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Copyright © 2021 Orendáčová and Kvašňák.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Alpha band after transcranial alternating current stimulation (tACS). This figure depicts the difference in EEG power spectrum between Experiment 1: Eyes-closed and Experiment 2: Eyes-open conditions. (AI) tACS group:fft spectra depicts pre- and post-stimulation changes in power spectrum for EEG frequencies in real tACS in eyes-closed condition. Axis y stays for power values (microvolts) and axis x stands for frequency values (Hz). tACS group: fft spectra depicts pre- and post-stimulation changes in power spectrum for EEG frequencies in sham tACS in eyes-closed condition. (BI) Normalized IAF power represents pre- and post-stimulation difference in relative power of individual alpha frequency (IAF) in real tACS group in eyes-closed condition. Axis y stays for power values (microvolts) and axis x stands for frequency values (Hz). (CI) IAF power post period increase represents pre- and post-stimulation difference in relative alpha power between stim and sham in eyes-closed condition. (AII) tACS group:fft spectra depicts pre- and post-stimulation changes in power spectrum for EEG frequencies in real tACS in eyes-open condition. Axis y stays for power values (microvolts) and axis x stands for frequency values (Hz). tACS group: fft spectra depicts pre- and post-stimulation changes in power spectrum for EEG frequencies in sham tACS in eyes-open condition. (BII) Normalized IAF power represents pre- and post-stimulation diference in relative power of individual alpha frequency (IAF) in real tACS group in eyes-open condition. Axis y stays for power values (microvolts) and axis x stands for frequency values (Hz). (CII) IAF power post period increase represents pre- and post-stimulation difference in relative alpha power between stim and sham in eyes-open condition. The symbol *represents the diference in post-stimulation alpha power between stim and sham group in eyes-open condition. [with the author's permission, taken from Neuling et al. (2013).