The Science of Sarcasm (not that you care)

There was nothing very interesting in Katherine Rankin's study of sarcasm — at least, nothing worth your important time. All she did was use an M.R.I. to find the place in the brain where the ability to detect sarcasm resides. But then, you probably already knew it was in the right parahippocampal gyrus.

What you may not have realized is that perceiving sarcasm, the smirking put-down that buries its barb by stating the opposite, requires a nifty mental trick that lies at the heart of social relations: figuring out what others are thinking. Those who lose the ability, whether through a head injury or the frontotemporal dementias afflicting the patients in Rankin's study, just do not get it when someone says during a hurricane, "Nice weather we're having...."

So is it possible that Jon Stewart, who wields sarcasm like a machete on "The Daily Show," has an unusually large right parahippocampal gyrus?

"His is probably just normal," Rankin said. "The right parahippocampal gyrus is involved in detecting sarcasm, not being sarcastic."

But, she quickly added, "I bet Jon Stewart has a huge right frontal lobe; that's where the sense of humor is detected on M.R.I."

A spokesman for Stewart said he would have no comment — not that a big-shot television star like Jon Stewart would care about the size of his neuroanatomy."