Fig. 1. fMRI with the modified Sternberg task for verbal memory (delayed item recognition task)

Fig. 2. Graphical depiction of significant activation regions on the cerebral cortex convexital surface during three periods of task compared with rest state (clusters containing more than 100 voxels are shown). А — encoding period; B — maintenance period; C — retrieval period. Left to right: top view, right view, left view. Color bars display the T-statistics level

Fig. 3. Comparison of activation map during the maintenance period with FPCN. FPCN is the fronto-parietal control network (according to [24])

Fig. 4. Temporal dynamics of BOLD signal intensity change in the clusters of activation in the left middle frontal gyrus, left inferior parietal lobule and left middle occipital gyrus, averaged over all participants and task blocks. All regions are shown on the surface of the left hemisphere. Solid line — periodically interpolated simulated signal, dashed line — filtered measured signal corrected for non-sphericity and head motion. The BOLD signal intensity is measured in arbitrary units. The origin corresponds to the rest state at the beginning of the block. Interpretation of these data in terms of neuronal events involved the subtraction of 5 seconds from the onsets of BOLD events to account for the hemodynamic delay