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Effective connectivity within the frontoparietal control network differentiates cognitive control and working memory
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Effective connectivity within the frontoparietal control network differentiates cognitive control and working memory
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Journal Article
Effective connectivity within the frontoparietal control network differentiates cognitive control and working memory
2015
Overview
Cognitive control and working memory rely upon a common fronto-parietal network that includes the inferior frontal junction (IFJ), dorsolateral prefrontal cortex (dlPFC), pre-supplementary motor area/dorsal anterior cingulate cortex (pSMA/dACC), and intraparietal sulcus (IPS). This network is able to flexibly adapt its function in response to changing behavioral goals, mediating a wide range of cognitive demands. Here we apply dynamic causal modeling to functional magnetic resonance imaging data to characterize task-related alterations in the strength of network interactions across distinct cognitive processes. Evidence in favor of task-related connectivity dynamics was accrued across a very large space of possible network structures. Cognitive control and working memory demands were manipulated using a factorial combination of the multi-source interference task and a verbal 2-back working memory task, respectively. Both were found to alter the sensitivity of the IFJ to perceptual information, and to increase IFJ-to-pSMA/dACC connectivity. In contrast, increased connectivity from the pSMA/dACC to the IPS, as well as from the dlPFC to the IFJ, was uniquely driven by cognitive control demands; a task-induced negative influence of the dlPFC on the pSMA/dACC was specific to working memory demands. These results reflect a system of both shared and unique context-dependent dynamics within the fronto-parietal network. Mechanisms supporting cognitive engagement, response selection, and action evaluation may be shared across cognitive domains, while dynamic updating of task and context representations within this network are potentially specific to changing demands on cognitive control.
•Cognitive control and working memory rely on a common frontoparietal brain network.•Dynamic causal modeling used to assess shared and differential connectivity•Shared: cognitive engagement in inferior frontal junction•Shared: altered lateral-to-medial interactions, guiding action selection/evaluation•CC: altered rostral-to-caudal connectivity, updating task/context representations
Publisher
Elsevier Inc,Elsevier Limited
Subject
