You can't make this stuff up:

Democrats and Republicans Both Adept at Ignoring Facts, Study Finds. According to Drew Westen, director of clinical psychology at Emory University:

The test subjects on both sides of the political aisle reached totally biased conclusions by ignoring information that could not rationally be discounted .... Then, with their minds made up, brain activity ceased in the areas that deal with negative emotions such as disgust. But activity spiked in the circuits involved in reward, a response similar to what addicts experience when they get a fix ...

The study points to a total lack of reason in political decision-making.

"None of the circuits involved in conscious reasoning were particularly engaged," Westen said. "Essentially, it appears as if partisans twirl the cognitive kaleidoscope until they get the conclusions they want, and then they get massively reinforced for it, with the elimination of negative emotional states and activation of positive ones."

Notably absent were any increases in activation of the dorsolateral prefrontal cortex, the part of the brain most associated with reasoning.

The tests involved pairs of statements by the candidates, President George W. Bush and Senator John Kerry, that clearly contradicted each other. The test subjects were asked to consider and rate the discrepancy. Then they were presented with another statement that might explain away the contradiction. The scenario was repeated several times for each candidate.

The brain imaging revealed a consistent pattern. Both Republicans and Democrats consistently denied obvious contradictions for their own candidate but detected contradictions in the opposing candidate.

"The result is that partisan beliefs are calcified, and the person can learn very little from new data," Westen said.

I always knew you couldn't trust the ideologues, now I have scientific proof!  ¶ 3:19 PM