“Meta” consistency maps of K showing the percentage of subjects for whom each brain region was consistently the location of high K nodes.

<p>These maps exhibit clear task-specific patterns in the location of the consistently high K nodes. At rest, the precuneus was a major connecting hub in virtually every subject and every session. This consistency drops considerably in the n-back condition. However, the DLPFC becomes highly consistent in the n-back condition. The figure includes two axial slices through DLPFC and 3 sagital slices through the precuneus. Only right hemisphere sagital slices are shown as the left side essentially mirrored the right. The arrows point to DLPFC and the circles highlight the precuneus.</p

Mean whole-brain metrics for both resting and task states.

<p>Global mean metrics across all states were calculated for each subject and averaged as group means. E_glob, global efficiency; E_loc, local efficiency; K, average degree; (mean ± SD).</p

Mean metric values within the DLPC region for both resting and task states.

<p>Global mean metrics across all states were calculated for each subject and averaged as group means. E_glob, global efficiency; E_loc, local efficiency; K, average degree;(mean ± SD).</p

“Meta” consistency maps of <i>Eloc</i> showing the percentage of subjects for whom each brain region was consistently the location of high Eloc nodes.

<p>The DLPFC exhibited greater consistency across subjexts for the n-back condition compared to the resting condition. The precuneus appeared to have similar consistency between the resting and n-back conditions. The figure includes two axial slices through DLPFC and 3 sagital slices through the precuneus. Only right hemisphere sagital slices are shown as the left side essentially mirrored the right. The arrows point to DLPFC and the circles highlight the precuneus.</p

Nodes consistently connected to the top 15 percent high degree nodes in the DLPFC across sessions and subjects.

<p>The figure demonstrates that these top degree nodes changed connectivity considerably across conditions. At rest the connections were restricted to frontal cortex. During the n-back conditions connections were consistently present in the lateral parietal cortex. Two axial slices are shown to include the DLPFC and the lateral parietal cortex. The sagital slice is shown to include the precuneus (lacking any consistent connectivity) for comparison to other figures.</p

Nodes consistently connected to the top 15 percent high local efficiency nodes in the precuneus across sessions and subjects.

<p>The figure demonstrates that these top local efficiency nodes were primarily connected to adjacent brain areas. At rest the focus of connectivity is ventral and includes the posterior cingulate. During n-back the focus of connectivity is more dorsal and includes posterior parietal cortex. A sagital and axial slice through the precuneus are shown.</p

Mean metric values within the precuneus region for both resting and task states.

<p>Global mean metrics across all states were calculated for each subject and averaged as group means. E_glob, global efficiency; E_loc, local efficiency; K, average degree;(mean ± SD).</p

Summary of regression analyses for variables predicting working memory performance with d’ (<i>N</i> = 29).

<p>*<i>p</i> < .05.</p><p>**<i>p</i> < .01.</p><p>***<i>p</i> < .001</p><p>Summary of regression analyses for variables predicting working memory performance with d’ (<i>N</i> = 29).</p

Graphical Summary of Results from Final Regression Model.

<p>The predicted <i>d’</i> values from the final model (the model containing local efficiency during task, global efficiency during task, age group, average RT, and an interaction between global efficiency during task and age group as parameters) are plotted against observed local efficiency (A) and global efficiency (B) values during the 2-back task, respectively, and split by age group.</p