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. 2016 Sep 15;73(6):954–963. doi: 10.1093/geronb/gbw117

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Figure 1. — Schematic of a trial sequence in a single task block (Panel A) and a dual task block (Panel B). A repeat and a switch task trial are illustrated in the dual task block (note: all trials in single task blocks are repeat trials), along with the different types of Flankers. In the single task block (Panel A), Trial 1 is a same task incongruent flanker, Trial 2 is a no flanker, Trial 3 is a same task congruent flanker, and Trial 40 is a different task flanker. In the dual task block (Panel B), Trial 1 is a same task incongruent flanker, Trial 2 is a different task flanker, Trial 3 is a same task congruent flanker, and Trial 40 is a no flanker. The correct button presses for the four trials shown in the single task block (Panel A) are left index, left index, right index, left index for the single task block in the two-response condition, and left middle, left middle, left index, left middle in the four-response condition. For the dual task block (Panel B), the correct responses are right index, right index, left index, left index in the two-response condition, and left index, right middle, right index, left middle in the four-response condition.