From Differences in brain activity of conservatives & liberals: "This does not mean, however, that differences in ACC activity are directly correlated to political orientation. Although the brain mechanisms underlying conflict monitoring are already in place at a very early age, the environment is also likely to have a major influence political views."
From Underactive ACC and Conservativism: "I found the ACC-Conservatism study interesting because it provides a neural correlation with a behavioral pattern that I have observed repeatedly. I have long maintained that there is cognitive processing deficiency that underlies a commonly observed cluster of personality traits."
Posted in response to a study just published in Nature Neuroscience:
"Political scientists and psychologists have noted that, on average, conservatives show more structured and persistent cognitive styles, whereas liberals are more responsive to informational complexity, ambiguity and novelty. We tested the hypothesis that these profiles relate to differences in general neurocognitive functioning using event-related potentials, and found that greater liberalism was associated with stronger conflict-related anterior cingulate activity, suggesting greater neurocognitive sensitivity to cues for altering a habitual response pattern."
Amodio, D. M., et al. (2007). Neurocognitive correlates of liberalism and conservatism. Nat. Neurosci. doi:10.1038/nn1979. [Abstract]
Elsewhere: Red Brain, Blue Brain: Politics and Gray Matter :