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However, whatever the cause, clearly there are decisions that you make without really being aware of why you make them.

It's always a pleasure to read your well though out posts, Anthony. It's not just momentary chemistry, your hardware drives what you think you're deciding, as well. Perhaps consciousness is just allowing us to rationalize our choices. An evolutionary ego booster.

Differences in political ideology are a major source of human disagreement and conflict. There is increasing evidence that neurobiological mechanisms mediate individual differences in political ideology through effects on a conservative-liberal axis.
This review summarizes personality, evolutionary and genetic, cognitive, neuroimaging, and neurological studies of conservatism-liberalism and discusses how they might affect political ideology. What emerges from this highly variable literature is evidence for a normal right-sided “conservative-complex” involving structures sensitive to negativity bias, threat, disgust, and avoidance. This conservative-complex may be damaged with brain disease, sometimes leading to a pathological “liberal shift” or a reduced tendency to conservatism in political ideology. Although not deterministic, these findings recommend further research on politics and the brain.

Emphasis added. The full paper can be found here:

On just hardware structural differences.

? Political liberalism and conservatism were correlated with brain structure ? Liberalism was associated with the gray matter volume of anterior cingulate cortex ? Conservatism was associated with increased right amygdala size ? Results offer possible accounts for cognitive styles of liberals and conservatives

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