The wealth of insights into the brain’s functioning gained by neuroscience in recent years led to the development of new possibilities for intervening in the brain such as neurotransplantation, neural prostheses and brain stimulation techniques. Moreover, new and safer classes of psychopharmaceutical drugs lend themselves to neuroenhancement applications, i.e. they could be used to enhance cognitive capacities or emotional well-being without therapeutic need. This book offers extensive state-of-the-art accounts for these novel kinds of intervention, indicates future developments, and discusses the relevant philosophical, ethical and legal issues.