Rehabilitation in a plastic environment

People with damage to the central nervous system often undergo rehabilitation therapy. James Fawcett and Armin Curt examine how such therapy might work in conjunction with experimental approaches that increase the ability of neurons to form new connections. They discuss how animal studies raise questions about how to test such approaches in people in a field where firm data are already hard to come by. Phillip Popovich and Dana McTigue take a look at a specific type of nervous system damage spinal cord injury-and argue that the role of the immune system is underappreciated. They also suggest that one common therapy, application of glucocorticoids, might actually exacerbate the condition.