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. 2016 Sep 27;10:179. doi: 10.3389/fnbeh.2016.00179

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Copyright © 2016 Gan, Preston-Campbell, Moeller, Steinberg, Lane, Maloney, Parvaz, Goldstein and Alia-Klein.

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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(A) In each fMRI-PSAP trial, participants could choose between increasing their earnings by $0.4 (option “A”) and retaliating by subtracting $1 from their opponent's earnings (option “B,” no monetary gain to participant). (B) Events and earnings/losses are displayed for each trial type. Each trial lasted for 18 s. Within a trial participants could not switch between the monetary and retaliatory option. However, they could complete multiple monetary (=50 button presses) or retaliatory ratios (=40 button presses) if they were fast enough. There was a 2-s interval between trials (Inter-trial-interval) in which a blank screen was presented.