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. 2018 Apr 16;12:201. doi: 10.3389/fnins.2018.00201

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Copyright © 2018 Kang, Cai, Han, Tong, Li, Sokhadze, Casanova, Ouyang and Li.

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 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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MER analysis of an EEG segment of pre-stimulation. (A) The original EEG data from the pre-tDCS state; (B) The recurrence plot of (A), with ε = 13.2; (C) Change of entropy and cardinality with ε; (D) Symbolic recurrence plot; (E) Change of entropy ratio with ε (from 0.01 – 20.34 with 0.01 increment).