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. 2018 Jul 19;9:1228. doi: 10.3389/fpsyg.2018.01228

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Copyright © 2018 Figueira, Pacheco, Lobo, Volchan, Pereira, de Oliveira and David.

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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(A) Example of the sequential order of events in a trial. Each trial began with a fixation cross that remained on the screen throughout the entire trial. After 2000 to 2100 ms from the fixation cross onset, a neutral or an unpleasant picture was presented for 1000 ms in a blocked fashion. The change detection task started at 600 to 700 ms following the offset of the picture with an arrow cue for 200 ms. The arrow cue was replaced with a 100 ms memory array. The arrow pointed to the left on half of the trials. Then, there was a 900 ms retention interval (RI), followed by a test array. Participants were instructed to respond as quickly as possible and to try not to commit errors. (B) Topographical map showing the expected contralateral negativity during the RI arising from the left parietal-occipital electrodes when the cued hemifield was on the right.