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Publications [#277471] of Marty G. Woldorff

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Journal Articles

  1. Slagter, HA; Weissman, DH; Giesbrecht, B; Kenemans, JL; Mangun, GR; Kok, A; Woldorff, MG (2006). Brain regions activated by endogenous preparatory set shifting as revealed by fMRI.. Cognitive, Affective, & Behaviorial Neuroscience, 6(3), 175-189. [17243354], [doi]
    (last updated on 2018/04/21)

    Abstract:
    An ongoing controversy concerns whether executive control mechanisms can actively reconfigure the cognitive system in preparation for switching to a new task set. To address this question, we recorded brain activity from 14 healthy participants, using event-related functional magnetic resonance imaging, while they performed a cued attention task. Critically, in any particular trial, the cued task set was either the same as that in the previous trial or switched. As was hypothesized, cue-related, switch-specific preparatory activity was observed in a network of dorsal frontal and parietal brain areas that are typically associated with cognitive control processes. Moreover, the magnitude of switch-specific preparatory activity varied with the number of possible task sets that could be presented in a given trial block. These findings provide compelling support for the existence of top-down, preparatory control processes that enable set switching. Furthermore, they demonstrate that global task structure is a critical determinant of whether switch-specific preparatory activity is observed.


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