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. 2014 Aug 6;8:140. doi: 10.3389/fnsys.2014.00140

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Copyright © 2014 Richter, Guitart-Masip, Barman, Libeau, Behnisch, Czerney, Schanze, Assmann, Klein, Düzel, Zenker, Seidenbecher and Schott.

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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Experimental paradigm of the probabilistic monetary go/no-go task. Fractal images indicate the combination between action (go or no-go) and valence (reward or loss). On go trials, subjects press a button for the side of a circle. On no-go trials they withhold a response. Arrows indicate rewards (green) or losses (red). Horizontal bars (yellow) symbolize the absence of a win or a loss. The schematics at the bottom represent for each trial type the nomenclature (left), the possible outcomes and their probabilities after response to the target (“go”; middle), and the possible outcomes and their probability after withholding a response to the target (“no-go”; right). gw, go to win; gal, go to avoid losing; ngw, no-go to win; ngal, no-go to avoid losing; ITI, intertrial interval.