approached significancep = 0.064
The FRN amplitude of each condition is reported in S1 Fig Regarding the “unfair/unfair” ( p = 0.182) offers, no significant differences was found between the two face conditions, while comparisons for “fair/fair” offer approached significance ( p = 0.064). 3.4 P300 Regarding the central-parietal component P300 ( Fig 5 ), we observed a significant main effect for offer (F 1, 25 = 13.834, p <0.001) and electrode (F 1, 25 = 24.280, p <0.001), but no main effect of face (F 1, 25 = 3.342, p = 0.079).