Watch Dr. Alvarez-Buylla as he shows that neuronal replacement in adults is in fact feasible. His findings have led to a number of fundamental advances including the identification of adult neural stem cells, the demonstration that neuronal migration can take place in the mature brain, and that new neurons can integrate into established circuits. His discoveries have led to a new way of thinking about cell therapy for brain repair. His findings suggest that some of the neurons that “know” how to navigate and integrate within the adult brain can rekindle learning and could, perhaps, one day be used to correct brain disorders like epilepsy and Parkinson’s disease.