I think I’ve noticed the same thing here on occasion.

Democrats and Republicans alike are adept at making decisions without letting the facts get in the way, a new study shows.

And they get quite a rush from ignoring information that’s contrary to their point of view.

Researchers asked staunch party members from both sides to evaluate information that threatened their preferred candidate prior to the 2004 Presidential election. The subjects’ brains were monitored while they pondered. […]

The test subjects on both sides of the political aisle reached totally biased conclusions by ignoring information that could not rationally be discounted, Westen and his colleagues say.

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, Westen explained.

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

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.

How encouraging. But it may help explain the phenomenal success of extremely partisan blogs. Their readers are essentially addicts looking for a fix.