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→The causes in the light of brain research
# Conservatives have heightened sensitivity for detecting emotional faces and use emotion more effectively when campaigning. As the left face displays emotion more prominently<ref>[http://www.ncbi.nlm.nih.gov/pubmed/22567166 Thomas NA et al., Right-wing politicians prefer the emotional left, 2012</ref>
# Liberals have higher [[ACC]] gray volume, where as conservatives have more [[amygdala]] volume<ref>Kanai R, Feilden T, Firth C, Rees G (2011) Political orientations are correlated with brain structure in young adults. Curr Biol 21: 677–680.</ref>. ACC is connected to conflict resultion (rACC to social conflict and dACC to non-social conflict). Reward valence modulates conflict-driven attentional adaptation in the ACC<ref>[http://bernhard-hommel.eu/Van%20Steenbergen%20et%20al.%20(2012).%20Reward%20valence%20modulates%20conflict-driven%20attentional%20adaptation.pdf van Steenbergen, Guido P.H. Band and Bernhard Hommel, Reward valence modulates conflict-driven attentional adaptation: Electrophysiological evidence, 2012]</ref>
# Mutation in dopamin receptor DRD4 and intra-subjective nurturing (measured by number of friendships in adolescence) promote liberalism, where as on non-mutated people the intra-subjective do not change the political attitude<ref>[http://www.ncbi.nlm.nih.gov/pubmed/22282583 Settle JE et al., Friendships Moderate an Association Between a Dopamine Gene Variant and Political Ideology, 2011]</ref>