Enhanced response to subthreshold negative emotion (congruent negative vs. congruent neutral; ONegVNeg − ONeutVNeut) in the hippocampus (−22, −18, −22) (A) and amygdala (24, −2, −12) (B), demonstrating subliminal processing of minimal aversive signals in the limbic system. General response enhancement in congruent vs. incongruent negative conditions, reflecting additive [ONegVNeg− (ONegVNeut + ONeutVNeg)/2] and superadditive [(ONegVNeg −ONeutVNeut)−([ONegVNeut −ONeutVNeut] + [ONeutVNeg −ONeutVNeut])] effects of OV emotion integration, was observed in the right amygdala (additive: 18, −10, −22 (C); superadditive: 16, −12, −12 (D)). Insets i and ii provide zoom-in coronal and sagittal views of the superadditive cluster, respectively. Group statistical parametric maps (SPMs) were superimposed on the group mean T1 image (display threshold p< .005 uncorrected).