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One suggested mechanism behind such influence is that group membership triggers divergent visual facial representations for in\u2010group and out\u2010group members, which could constrain face processing. Here, using electroencephalography (<jats:styled-content style=\"fixed-case\">EEG<\/jats:styled-content>) under functional magnetic resonance imagery (<jats:styled-content style=\"fixed-case\">fMRI<\/jats:styled-content>) during a group categorization task, we investigated the impact of mere affiliation to an arbitrary group on the processing of emotional faces. The results indicate that in\u2010 and out\u2010group members trigger differential event\u2010related potential activity, appearing 150\u00a0ms after presentation of group membership information, which correlated with medial prefrontal <jats:styled-content style=\"fixed-case\">fMRI<\/jats:styled-content> activity. Additionally, <jats:styled-content style=\"fixed-case\">EEG<\/jats:styled-content> activity in the earliest stages of face processing (30\u2013100\u00a0ms after expression onset) dissociated unexpected group\u2010related emotions (in\u2010group anger and out\u2010group joy) from expected ones and correlated with temporo\u2010parietal junction <jats:styled-content style=\"fixed-case\">fMRI<\/jats:styled-content> activity. We discuss the possibility that such dissociation may result from top\u2010down influences from divergent representations for in\u2010group and out\u2010group members. 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