We’re not exactly talking Pinky and the Brain here, of course. The mice were killed soon after birth, and their relative intelligence was not tested. Increased brain folds don’t necessarily mean increased smarts. And, as I mentioned at Boing Boing, I’m reminded of something Roger Ebert wrote in his review of “Deep Blue Sea”:

“Its premise is that the shark brains have been increased fivefold, with a corresponding increase in intelligence, so that the sharks can figure out the layout of the station and work together to batter down watertight doors, swim down corridors, etc. The most obvious problem with this premise is that just because a shark is smarter doesn’t mean it has more information; the smartest shark in the world would only know how to be a smart shark unless it had a way to learn.”