'Mathematical models of cognition so often seem like mere formal exercises. Quantum theory is a rare exception. Without sacrificing formal rigor, it captures deep insights about the workings of the mind with elegant simplicity. This book promises to revolutionize the way we think about thinking.' Steven Sloman, Brown University, Rhode Island

'This book is about why and how formal structures of quantum theory are essential for psychology - a breakthrough resolving long-standing problems and suggesting novel routes for future research, convincingly presented by two main experts in the field.' Harald Atmanspacher, Institut fuer Grenzgebiete der Psychologie und Psychohygiene e.V.

'This is the first book putting forward the main scientific results of an intriguing and promising new research domain called 'quantum cognition'. In this emergent field, the mathematical structure of quantum theory is employed to model essential aspects of human cognition impossible to be modelled properly within classical approaches. The authors are both engaged intensively in quantum cognition and [have written] a high-quality and well-understandable treatise showing how this new approach carries the potential of a real breakthrough, with deep implications for how cognition will be looked upon in the decades to come. The approach may also signify a thorough new opening to the old problem of artificial intelligence and the structuring of semantics.' Diederik Aerts, Brussels Free University