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    His and Her Humor on Different Plane

    Men and Women Take a Joke Differently Deep Inside Their Brains
    By
    WebMD Health News
    Reviewed by Louise Chang, MD

    Nov. 7, 2005 -- Humor hits men and women differently, new brain research shows.

    The findings appear in Proceedings of the National Academy of the Sciences, a serious journal that's not very giggly reading.

    Two studies in the journal's online edition pair humor with high-tech science. The results may be enlightening about how men's and women's brains handle emotions.

    Funny or Not?

    The rules were simple:

    • View a bunch of cartoons one by one.
    • Press a button to call each cartoon funny or not.
    • Rank the funny ones on a 1-to-10 scale (scarcely funny to absolutely hilarious).
    • Meanwhile, get your brain scanned by functional magnetic resonance imaging (fMRI).

    Ten women and 10 men did that. Eiman Azim and colleagues kept watch. At the time, Azim was a Stanford University undergraduate student; now, he's a graduate student at Harvard University.

    Both sexes found about eight out of 10 cartoons funny. Men and women mainly agreed about which cartoons were funny.

    Their brains, however, handled humor differently.

    Her Brain, His Brain

    When women found cartoons funny, their brain scans showed more activity in certain brain areas, including the nucleus accumbens.

    When the women saw cartoons that didn't tickle their funny bone, their nucleus accumbens had a ho-hum response.

    Men's brain scans were different. Their nucleus accumbens didn't react to funny cartoons and showed a drop in activity with unfunny cartoons.

    The Punch Line: Surprise Matters

    Surprise may be at the heart of the study. Here's the researchers' theory.

    Perhaps women didn't expect cartoons to be funny, while men expected the opposite. When they got what they expected, their nucleus accumbens were calm.

    When women were pleasantly surprised, their brain scans may have reflected that with a flurry of activity in the nucleus accumbens.

    Men, on the other hand, may have been let down by unfunny cartoons, causing a dip in that brain area's activity.

    If so, it might be a new clue about emotional responses. That could prove interesting for depression research, write Azim and colleagues.

    "The results help explain previous findings suggesting women and men differ in how humor is used and appreciated," says Allan Reiss, MD, in a news release.

    Reiss is Stanford's Howard C. Robbins Professor of Psychiatry and Behavioral Sciences. He also directs Stanford's Center for Interdisciplinary Brain Sciences research. Reiss worked on both of the new studies on humor.

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