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. 2014 Apr 10;5:309. doi: 10.3389/fpsyg.2014.00309

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Copyright © 2014 Ásgeirsson and Kristjánsson.

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) A trial started when a fixation-cross appeared. The stimulus array was presented until response, followed by a feedback display signifying the amount of reward or punishment obtained on the current trial. (B) All possible trial types relative to the example trial type in panel (A). Each type was equally likely and the amount of reward was not related to trial type or any other task attribute. Note that the main hypothesis is tested by calculating the means of trials where the irrelevant singleton was present on the current trial, but absent on the previous (n-1) trial. The target is always shown as a low spatial frequency singleton in the western position. Targets could also be high spatial frequency singletons, among low-frequency ones, and were equally likely to appear at any of the four positions. Stimuli are not drawn to scale. See Stimuli and apparatus for stimulus specifications.