In her first week in college, Annalisa Meier was struck with a mysterious illness that left her in a coma. Doctors struggled to come up with a diagnosis, but as soon as Kiwon Lee walked into her room in the neuro ICU at New York-Presbyterian/Columbia, Annalisa violently jerked her head to the side, stuck out her tongue, and smacked her lips in a violent, repetitive, chewing motion. "She had this rhythmic movement that's so classic," he says. "When I saw that, I was 99 percent sure I knew what we were dealing with."