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. 2017 Jul 31;11:388. doi: 10.3389/fnhum.2017.00388

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Copyright © 2017 Ko, Komarov, Hairston, Jung 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) or licensor 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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During the lectures, images of simple geometric objects (stimuli) appeared on the screen. Each participant had a smartphone with an application that displayed all possible choices in the form of buttons with pictures. The time interval between an appearance of the stimulus on the screen and pressing the button defined the response time (RT). Two second long intervals of the EEG records immediately preceding appearances of the stimuli were extracted as epochs to investigate tonic changes in the EEG power spectra.