Figure 2.

Schematic illustration of some white matter tracts mapped in previous studies that used diffusion tensor imaging and tractography analysis. It is, however, important to keep in mind some of the limitations in using such techniques to quantify structural connectivity in vivo (see review in Jones 2010; Jones and Cercignani 2010). For ease of illustration, the tracts are oversimplified (i.e., not shown at their exact extent and localization). The names of the tracts are kept identical to the ones used in the original studies. The exact localization and full extent of each tract can be retrieved from their original studies as explicitly listed below: SLF-II = superior longitudinal fasciculus–second branch (cf. Figure 3 of Makris and others 2005); SLF-III = superior longitudinal fasciculus–third branch (cf. Figure 8 of Frey and others 2008); MLF = middle longitudinal fasciculus (cf. Figures 5–7 of Makris and others 2009, Figure 7 of Frey and others 2008); ILF = the inferior longitudinal fascicle (cf. Figure 5 of Rushworth and others 2006); OFF = occipitofrontal fascicle (cf. Figure 8 of Makris and others 2007); IOFF = inferior occipitofrontal fascicle (cf. Figure 5 of Uddin and others 2010). OFF and IOFF may correspond to the same tract (see discussion in Makris and others 2007), although other studies have suggested the existence of both inferior and superior OFF in humans. BA = Brodmann area; AG = angular gyrus; SOG = superior occipital gyrus; Pcu = precuneus; pSMG = posterior supramarginal gyrus; MTG/ITG = middle temporal gyrus/inferior temporal gyrus; HP/PHG = hippocampus/parahippocampal gyrus; IFG = inferior frontal gyrus; MFG = middle frontal gyrus; SFG = superior frontal gyrus.