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. 2021 Jul 26;15:653632. doi: 10.3389/fnins.2021.653632

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Copyright © 2021 Prabhakaran, Al-Nosairy, Tempelmann, Wagner, Thieme and Hoffmann.

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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Illustration of temporal sequence of a single stimulus cycle. Each 24 s cycle comprised a 12 s motion block (drifting patterns) block and a 12 s mean blank block (mean luminance gray). A total of 10 cycles were presented per fMRI run, resulting in a total duration of 240 s. The motion block consisted of 12 1-s trials comprising 750 ms motion stimulus (drifting in one of 8 different directions, as indicated by yellow arrows added for visualization) and 250 ms mean luminance gray. Identical stimuli were presented for three different task conditions in separate fMRI runs: (i) passive viewing (PV), (ii) one-back task (OBT), (iii) fixation-dot task (FDT), as detailed in section “Materials and Methods”.