The Science of Being Partisan. The Times gives us a nice work-break read. Scientists have studies M.R.I. scans revealing reactions in the brains of admitted partisans upon their seeing political commercials and images of politicians. Sorta a fun read, albeit no huge conclusions yet.

One of the most striking results so far is the way subjects react to candidates after seeing a campaign commercial. At the start of the session, when they look at photographs of Mr. Bush, Mr. Kerry and Ralph Nader, subjects from both parties tend to show emotional reactions to all the candidates, indicated in the ventromedial prefrontal cortex, an area of the brain associated with reflexive reactions.

But then, after the Bush campaign commercial is shown, the subjects respond in a partisan fashion when the photographs are shown again. They still respond emotionally to the candidate of their party, but when they see the other party's candidate, there is more activity in the rational part of the brain, the dorsolateral prefrontal cortex. "It seems as if they're really identifying with their own candidate, whereas when they see the opponent, they're using their rational apparatus to argue against him," Professor Iacoboni said.