Why is it Difficult to Search for Two Colors at Once? How Eye Movements Can Reveal the Nature of Representations During Multi-target Visual Search

representations of guns, knives and bombs. Further, the experiment encouraged color selectivity, but also contained a difficult shape manipulation. Thus, the reduction in selectivity may be a reflection of the objects containing features across two different dimensions, but it is difficult to disentangle the effects each dimension has on this reduction. The current study utilizes a similar paradigm but maintains tight control over the features and dimensions used. The purpose of the current investigation is to examine how multiple targets that vary across a single feature dimension are represented to guide