Notion Disable Smart Quotes

Washington University found that adding a single extra gene dramatically boosted a mouse’s memory and ability. These “smart mice” could navigate mazes faster, remember events better, and outperform other mice in a wide variety of tests. They were dubbed “Doogie mice,” after the precocious character on the TV show Doogie Howser, M.D. Dr. Tsien began by analyzing the gene NR2B, which acts like a switch controlling the brain’s ability to associate one event with another. (Scientists know this because when the gene is silenced or rendered inactive, mice lose this ability.) All learning depends on NR2B, because it controls the communication between memory cells of the hippocampus. First Dr. Tsien created a strain of mice that lacked NR2B, and they showed impaired memory and learning disabilities. Then he created a strain of mice that had more copies of NR2B than normal, and found that the new mice had superior mental capabilities. Placed in a shallow pan of water and forced to swim, normal mice would swim randomly about. They had forgotten from just a few days before that there was a hidden underwater platform. The smart mice, however, went straight to the hidden platform on the first try. Since then, researchers have been able to confirm these results in other labs and create even smarter strains of mice. In 2009, Dr. Tsien published a paper announcing yet another strain of smart mice, dubbed “Hobbie-J” (named after a character in Chinese cartoons). Hobbie-J was able to remember novel facts (such as the location of toys) three times longer than the genetically modified strain of mouse previously thought to be the smartest. “This adds to the notion that NR2B is a universal switch for memory formation,” remarked Dr. Tsien. “It’s like taking Michael Jordon and making him a super Michael Jordan,” said graduate student Deheng Wang. There are limits, however, even to this new mice strain. When these mice were given a choice to take a left or right turn to get a chocolate reward, Hobbie-J was able to remember the correct path for much longer than the normal mice, but after five minutes he, too, forgot. “We can never turn it into a mathematician. They are rats, after all,” says Dr. Tsien. It should also be pointed out that some of the strains of smart mice were exceptionally timid compared to normal mice. Some suspect that, if your memory becomes too great, you also remember all the failures and hurts as well, perhaps making you hesitant. So there is also a potential downside to remembering too much.