“…With regard to the current study, it is possible that individual differences in preferring to interact with an agent (i.e., human or robot), may have caused people to recruit brain regions differently for HGFs versus RGFs, with the consequence that participants who activated prefrontal areas during gaze following already at baseline benefitted more from tDCS stimulation. This interpretation is in line with previous studies that have shown individual differences to influence the efficacy of tDCS (Blumberg et al, 2014;Bullard et al, 2011;Foroughi, Wren, Barragán, Mead, & Boehm-Davis, 2015;Krause & Cohen Kadosh, 2014;Stephens, Jones, & Berryhill, 2017).…”