“…In addition, we explored several other sources, including (1) direct searches on the names of frequently occurring authors, (2) the bibliography and citation indices of the pre-selected articles, and (3) the reference r Luo et al r r 442 r list of related reviews [Aoki et al, 2015;Du and Chang, 2015;Falk et al, 2012;Fehr and Camerer, 2007;Insel and Fernald, 2004;Izuma, 2013;Jankowski and Takahashi, 2014;Kedia et al, 2014b;Rilling and Sanfey, 2011;Ruff and Fehr, 2014;Swencionis and Fiske, 2014;Tricomi and Sullivan-Toole, 2015]. The search resulted into 119 potential studies, which were further assessed according to the following criteria: (i) subjects were free from psychiatric or neurological diagnoses and neuropharmacological influence; (ii) subjects performed tasks in the context of social comparison; (iii) fMRI was used as the imaging modality; (iv) whole-brain generallinear-model-based analyses (rather than region of interest [ROI] analyses) were applied; (v) statistical models for contrasts of downward/upward social comparison or relevant parametric analyses were reported; and (vi) activations were presented in a standardized stereotaxic space (Talairach or MNI).…”