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. 2011 Aug 30;5:87. doi: 10.3389/fnhum.2011.00087

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Copyright © 2011 Clithero, Reeck, Carter, Smith and Huettel.

This is an open-access article subject to a non-exclusive license between the authors and Frontiers Media SA, which permits use, distribution and reproduction in other forums, provided the original authors and source are credited and other Frontiers conditions are complied with.

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Reward anticipation task. The reward anticipation task had five conditions according to potential outcome: $5 Cash (BM), $1 Cash (SM), Large Candy (BC), Small Candy (SC), and Zero (no cash or candy). Each trial began with a 1000-ms cue indicating the potential reward for that trial. Following a variable delay of 2000–2500 ms, a target appeared on the screen. The participant's task was to respond by pressing a button with their right index finger, before the target disappeared. Successful trials were indicated by a dollar sign (cash trials) or a cartoon (candy trials), whereas unsuccessful trials were indicated by a zero. Feedback for all trials was presented for 1500 ms.