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. 2018 Mar 27;12:181. doi: 10.3389/fnins.2018.00181

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Copyright © 2018 Chuang, Cao, King, Wu, Wang and Lin.

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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Trends of occipital channel (Oz, O1, and O2) pre-stimulus EEG power in four frequency bands (delta: 1–3 Hz; theta: 4–7 Hz; alpha: 8-12 Hz; beta: 13–30 Hz). The thick and transparent lines represent the regression trend and actual graph in four frequency bands, respectively.