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. Author manuscript; available in PMC: 2021 Jun 1.
Published in final edited form as: Neuroimage. 2020 Mar 14;213:116747. doi: 10.1016/j.neuroimage.2020.116747

Figure 1. Experimental paradigm.

Figure 1.

Each trial started with a central fixation cross presented for an interstimulus interval of 2000-2400 ms. A row of three equally-spaced integers between 0 and 3 then replaced the fixation, and these stimuli were presented for 1500 ms. Two of the number stimuli were always identical (task-irrelevant), and the third unique to that trial (task-relevant). Participants were given a five-finger button pad and instructed that the index, middle, and ring finger locations represented the integers 1, 2, and 3, respectively. Participants were instructed that on each trial they would be presented with a row of three integers, and that the objective was to indicate the “odd-number-out” by pressing the button corresponding to its numerical identity (and not its spatial location). Using these stimuli, four interference conditions were possible: (1) Control (no interference), (2) Simon (stimulus-response interference), (3) Flanker (stimulus-stimulus interference), and (4) Multi-Source.