Neuroscientists have created a quick but reliable test that can measure a person's creativity from single spoken words. The "noun-verb" test is so simple it can be done by virtually anyone anywhere -- even in an MRI machine, setting the stage for scientists to pinpoint how the brain comes up with unusually creative ideas. While some believe ingenuity is spontaneous, the researchers suspect there's a lot of hard work going on in the brain even when the proverbial light bulb turning on feels effortless.