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The RS and VS tasks were formally similar. Both tasks were composed of blocks of 9–11 items separated by the presentation of cues. The cues were either switch or stay cues that instructed subjects to switch the selection rule or to continue with the current selection rule, respectively. The BOLD signals, modeled as γ-density functions with a mean lag of 7 sec and an SD of 3 sec (gray regions) after switch and stay cues were compared.
