Anatomical connections underlying personally-familiar face processing

The second level analysis allowed the definition of functional activated areas related to the evaluated task. For the core system, functional ROIs were obtained directly from the t-contrast defined as unfamiliar faces > houses what evinced face-selective areas (p<0.05 uncorrected). The extended system ROIs were obtained from the contrast familiar faces > unfamiliar faces which uncover those areas related to familiarity processing (p-value<0.05 uncorrected). This relaxed p-value was used to avoid the dilatation of the ROIs into the white matter to maximize contact with streamlines during tractography. The MarsBaR toolbox (http://marsbar.sourceforge.net/) was used for defining the functional ROIs from these previous contrasts. The resulting regions from the contrasts unfamiliar faces > houses were OFA/FFA (left and right) and STSp (left and right) representing core system, while familiar faces > unfamiliar faces uncovered the mOF/AC, MC, PC, left and right Ins, belonging to the extended system of face processing. The resulting probabilistic tracking among this ROIs is store in .mat files for each subject and for both scanner (Siemens and GE) used in this study, and for the validation data as well (MGH). The matrix order is: CA, CM, CP, Ins_L, Ins_R, OFA_FFA_L, OFA_FFA_R, STSp_L, STSp_R, Vis. For further details refers to the original paper published by PlosOne (insert reference when the paper is published)