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. Author manuscript; available in PMC: 2009 Sep 23.
Published in final edited form as: J Cogn Neurosci. 2009 Jul;21(7):1447–1460. doi: 10.1162/jocn.2009.21005

Figure 2.

Figure 2

Task timing. (A) Experiment 1—left–right target experiment: 16-sec blocks of passive fixation (Fix) alternated with blocks of directed attention to the right (Right) or left (Left) targets (schematic of target array in upper right of A). Each full cycle of “Fix, Right, Fix, Left” was repeated four times per scan run. MRI imaging TR = 2 sec. Lower graphs: Reference waveforms used to detect activation for attend-right or attend-left blocks. (B) Experiment 2—Eccentricity sequence: Every 10 sec, subjects shifted attention successively to each of four targets increasing in eccentricity (schematic in upper right of B) repeated five times per scan run. In this temporal phase mapping paradigm, there was no passive fixation period. Subjects just shifted attention from location to location as cued. Lower graphs: Reference waveforms used to detect activation for each eccentricity (each phase delay).