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. 2013 Jan 30;8(1):e55455. doi: 10.1371/journal.pone.0055455

Figure 2. Results for relatively easier mental arithmetic (e.g., 14+3 = ?).

Figure 2

Panel A reflects cortical regions showing increase of fMRI signal due to decreasing values of the conjunction of unit sum as well as decade sum (uncorrected p-value of<.005, cluster size k = 10 voxels). Activated areas for fact-retrieval related processing include left AG, STG, MTG, insula, retro-splenial cortex (RC), and medial FG. Panel B shows identified pathways for easier mental arithmetic in a 3D volume rendering (PIBI values>0.0148) indicating prominently ventral (MdLF) connections (depicted in green). Furthermore, a dorsal connection via the cingulate bundle was tracked linking retro-splenial cortex with the medial frontal gyrus. Panel C again gives a detailed view on the course of the fiber tracts in axial orientation illustrating the prominently ventral fiber pathway profile. The ventral connection encompassed the MdLF and the more superior and medial part of the EC/EmC system (depicted in green). Abbreviations: AG = angular gyrus; cb = callosal bundle; medial FG = medial frontal gyrus; MdLF = middle longitudinal fascicle; MTG = middle temporal gyrus; RC = retrosplenial cortex; SMG = supramarginal gyrus; STG = superior temporal gyrus.