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. 2016 Sep 19;26(10):3977–3990. doi: 10.1093/cercor/bhw245

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© The Author 2016. Published by Oxford University Press.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 2. — Protocol dependent tACS effects on cortical excitability. Percentage of increase or decrease of the MEP size during sham, 7 Hz and 20 Hz tACS compared with the tACS OFF condition (baseline) for the 5 tested protocols. Only the effects of the short afferent inhibition (SAI—bottom panel) protocol were dependent on the tACS stimulation frequency (one-way ANOVA; P = 0.006). MEP size selectively increased during 20 Hz tACS stimulation. Asterisks denote significant difference (20 Hz vs sham P = 0.047; 20 Hz vs 7 Hz P = 0.046).