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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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Beta to theta band power ratio at the Oz channel in experimental trials sorted according to the respective normalized RTs. The solid line linearly interpolates 10 mean values, which are calculated with a step of 10% of trials. The error bars show the standard deviations in the subgroups separated by the deciles. When the response time exceeds 1.3 times the mean alert state response time, the mean beta to theta power ratio decreases monotonically and steadily from 0.75 (30–40% subgroup, average normalized RT equals 1.3) to 0.66 (90–100% subgroup, average normalized RT equals 2.7).