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The many faces of preparatory control in task switching: Reviewing a decade of fMRI research

期刊

HUMAN BRAIN MAPPING
卷 34, 期 1, 页码 12-35

出版社

WILEY
DOI: 10.1002/hbm.21420

关键词

task preparation; proactive control; cognitive flexibility; reconfiguration; proactive interference; biased competition; task set; action set; attentional set; set shifting; goal representation; task demand

资金

  1. Career ESF-Fellowship [ESF 080938749]
  2. European Union
  3. Saxony State Ministry for Science and Art, Germany

向作者/读者索取更多资源

A large body of behavioural research has used the cued task-switching paradigm to characterize the nature of trial-by-trial preparatory adjustments that enable fluent task implementation when demands on cognitive flexibility are high. This work reviews the growing number of fMRI studies on the same topic, mostly focusing on the central hypothesis that preparatory adjustments should be indicated by enhanced prefrontal and parietal BOLD activation in task switch when compared with task repeat trials under conditions that enable advance task preparation. The evaluation of this straight-forward hypothesis reveals surprisingly heterogeneous results regarding both the precise localization and the very existence of switch-related preparatory activation. Explanations for these inconsistencies are considered on two levels. First, we discuss methodological issues regarding (i) the possible impact of different fMRI-specific experimental design modifications and (ii) statistical uncertainty in the context of massively multivariate imaging data. Second, we discuss explanations related to the multidimensional nature of task preparation itself. Specifically, the precise localization and the size of switch-related preparatory activation might depend on the differential interplay of hierarchical control via abstract task goals and attentional versus action-directed preparatory processes. We argue that different preparatory modes can be adopted relying either on advance goal activation alone or on the advance resolution of competition within action sets or attentional sets. Importantly, while either mode can result in a reduction of behavioral switch cost, only the latter two are supposed to be associated with enhanced switch versus repeat BOLD activation in prepared trial conditions. Hum Brain Mapp, 2013. (c) 2011 Wiley Periodicals, Inc.

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