Abstract
The default mode network (DMN) efficient deactivation and suppressed functional connectivity (FC) during goal-directed tasks, which require attentional resources, have been considered essential to healthy brain cognition. However, recent studies have shown that DMN regions do not always show the expected behavior. Then, we aimed to investigate the functional activation and connectivity of DMN nodes in young, healthy controls during a goal-directed task. We used an adaptation of the symbol digit modalities test (SDMT) to evaluate the information processing speed (IPS). Twenty-four subjects (10 women, age: 29 ± 7 years) underwent two functional Magnetic Resonance Imaging experiments: one during resting-state and one during a block-designed SDMT paradigm. We superimposed the templates of the DMN on the group activation map and observed the reorganization of the network. For the posterior cingulate cortex (PCC) node of the DMN, which is spatially extensive, comprising the precuneus (dorsal portion) and the posterior cingulate gyrus (PCG, ventral portion), the extent of each region was different between conditions, suggesting different functional roles for them. Therefore, for the functional connectivity (FC) analysis, we split the DMN-PCC region into two regions: left precuneus (BA 7) and PCG. The left precuneus (BA 7) was positively correlated with the left lingual gyrus (BA 17), a task-positive region, and negatively associated with the DMN nodes when comparing task performance with the resting-state condition. The other DMN regions presented the classical antagonistic role during the attentional task. In conclusion, we found that the activation and functional connectivity of the DMN is, in general, suppressed during the information processing. However, the left precuneus BA 7 presented a context-dependent modulatory behavior, working as a transient in-between hub connecting the DMN to task-positive areas. Such findings support studies that show increased activation and excitatory functional connectivity of DMN portions during goal-directed tasks. Moreover, our results may contribute to defining more precise functional correlates of IPS deficits in a wide range of clinical and neurological diseases.
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The software and routines used in the present study are all available in their respective references.
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Data is not available due to patient confidentiality.
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The authors would like to acknowledge Dr. Carina Tellaroli Spedo for conducting the cognitive evaluation.
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This work was supported by the Fundação de Apoio à Pesquisa do Estado de São Paulo (FAPESP), process number 2017/22212-0.
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PHRS contributed to study conception and design, image processing, analysis, and manuscript writing. CR contributed to discussion, manuscript writing, and revision. RFL contributed to study conception and design, analysis, and manuscript revision.
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da Silva, P.H.R., Rondinoni, C. & Leoni, R.F. Non-classical behavior of the default mode network regions during an information processing task. Brain Struct Funct 225, 2553–2562 (2020). https://doi.org/10.1007/s00429-020-02143-1
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DOI: https://doi.org/10.1007/s00429-020-02143-1