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. 2015 Mar 22;34(1):13. doi: 10.1186/s40101-015-0049-3

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© Motomura et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Emotional gambling task design. Participants observed their partner performing an emotional gambling task through a monitor displaying the task. Two boxes, labeled A and B (angle of field, 2.62° × 3.59°; interval between boxes, 2.76°), were displayed on each of their monitors. Each time their partner presses a button to choose either A or B, an emotional negative or positive image is presented 500 ms after the choice on only the partner’s monitor and simultaneously a sad or happy face symbol is presented on the participant’s monitor. Each valence (positive or negative) trial was performed 100 times, respectively, and a total of 200 images or face symbols were presented. EEG Amp = electroencephalogram amplifier; ERP = event-related potentials.