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. Author manuscript; available in PMC: 2011 May 15.
Published in final edited form as: Neuroimage. 2010 Feb 1;51(1):421–431. doi: 10.1016/j.neuroimage.2010.01.089

Figure 1.

Figure 1

Examples of stimuli used in each condition. Stimuli were hierarchical colored letters (H, S, and O) with a larger (global) letter made up of smaller (local) letters. Each stimulus represents a single trial; groups of stimuli represent block types. Each block consisted of 12 stimuli. Each block could either involve shifting between the global and local levels, as cued by the stimulus color, or responding only to one level (non-shifting). Stimuli could be congruent (the global and local levels prompt the same response), neutral (one level has no associated response), or incongruent (the two levels prompt opposing responses). Congruent trials involve facilitation, while incongruent trials involve inhibition of the non-attended level. The six block types were therefore: congruent non-shifting (CN), congruent shifting (CS), neutral non-shifting (NN), neutral shifting (NS), incongruent non-shifting (IN), and incongruent shifting (IS).