Political Orientation, Personality, and Brain Structure?

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We’re heading in to a discussion of the highly polarized nature of American political discourse lately. There is some research suggesting that liberals and conservatives may differ in fundamental ways having to do with personality or even biology. A story in the L.A. Times reports on research showing conservatives are more fearful in general: “Why Conservatives are More Likely than Liberals to Believe False Information about Threats.” Other research suggests liberals and conservative actually have different brain structures, although one wonders whether those observed differences are cause or effect of political orientation.