Proceedings of the Annual Meeting of the Cognitive Science Society

In this paper we demonstrate that a target detection taskis facilitated when the background on which the targetis presented is a familiar one, even though the targetappears at a random location. We compare performancein that condition with one where the background israndomly generated and establish a significantdifference between these two versions of the task interms of both d’ and criterion, C. We also go on to lookat the effect of a tDCS procedure that we know to affectdiscrimination performance on this difference,discovering that it seems to reduce or reverse thedifference in criterion for these two conditions. Weascribe this effect to the neurostimulation manipulationshifting the distribution of information used to reach adecision