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. 2020 Apr 8;14:315. doi: 10.3389/fnins.2020.00315

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Copyright © 2020 Flanagan, Proessl, Dunn-Lewis, Canino, Sterczala, Connaboy, DuPont, Caldwell and Kraemer.

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(s) 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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Choice Reaction Test Setup. Participants responded to the random illumination of one of five equidistantly spaced circles by touching the corresponding point on the presentation screen (upper-body CRT) or foot pad (lower-body CRT) as quickly and accurately as possible. Each test was comprised of 120 stimuli divided into three blocks of 40 with 30s rest between and a 500 ± 30 ms post-response stimulus onset delay. Stimulus onset and offset (response) timing were detected with photodiodes and marked at the corresponding timepoints in continuous EEG recordings with minimal delay or jitter (≤2 ms). Comparison of analog event markers and computer-generated response times confirmed the accuracy of stimulus and response co-registration. CRT, choice reaction test.