Implicit learning is a fundamental feature of human cognition. Many essential skills, including language comprehension and production, intuitive decision making, and social interaction, are largely dependent on implicit (unconscious) knowledge. Given its relevance, it is not surprising that the study of implicit learning plays a central role in the cognitive sciences. The present volume brings together eminent researchers from a variety of fields (e.g., cognitive psychology, linguistics, education, cognitive neuroscience, developmental psychology) in order to assess the progress made in the study of implicit and explicit learning, to critically evaluate key concepts and methodologies, and to determine future directions to take in this interdisciplinary enterprise. The eighteen chapters in this volume are written in an accessible and engaging fashion; together, they provide the reader with a comprehensive snapshot of the exciting current work on the implicit and explicit learning of languages.