A decade ago, at age 55, Don Lewis suffered a stroke in his sleep. When he woke up, he couldn’t move his left arm or leg. Lewis’ neighbor realized his truck hadn’t moved in two days and called 911 for ...

Graphesthesia, also called graphagnosia, is the ability to recognize symbols when they’re traced on the skin. “Graph” means writing and “esthesia” means sensing. This ability is a measure of cortical ...