There is a growing literature in neuroethics dealing with cognitive neuro-enhancement for healthy adults. However, discussions on this topic tend to focus on abstract theoretical positions while concrete policy proposals and detailed models are scarce. Furthermore, discussions appear to rely solely on data from the US or UK, while international perspectives are mostly non-existent. This volume fills this gap and addresses issues on cognitive enhancement comprehensively in three important ways: 1) it examines the conceptual implications stemming from competing points of view about the nature and goals of enhancement; 2) it addresses the ethical, social, and legal implications of neuroenhancement from an international and global perspective including contributions from scholars in Africa, Asia, Australia, Europe, North America, and South America; and 3) it discusses and analyzes concrete legal issues and policy options tailored to specific contexts.