Quantum Models of Cognition and Decision, Second Edition presents a fully updated and expanded version of this innovative and path-breaking text. It offers an accessible introduction to the intersection of quantum theory and cognitive science, covering new insights, modelling techniques, and applications for understanding human cognition and decision making. In it, Busemeyer and Bruza delve into such topics as the non-commutative nature of judgments, quantum interference as a general principle governing human decision making, contextuality in modelling human cognition, and thought-provoking speculation about what a quantum approach to cognition might reveal about the ultimate nature of the human mind. Additions include new material on measurement, open systems, and applications to computer science. Requiring no prior background in quantum physics, this book comes complete with a tutorial and fully worked-out applications in important areas of cognition and decision. ‘Highly recommended both as an introduction for newcomers and a survey of advanced research, to which the authors contributed significantly. It is wonderful to see how (and why) quantum concepts can be rigorously and elegantly applied in areas outside physics, the science where they originated a century ago. It won't take another century for psychology to profoundly expand its insights as this innovative way of thinking keeps unfolding.' Harald Atmanspacher, ETH Zurich and University of Essex ‘If you are on the hunt for deep thinking paired with theoretical imagination in psychology, this is the book for you. Its proposal to understand cognition through the theoretical lens of quantum theory is not only well-reasoned but also deeply enjoyable. The quantum models, albeit quite different from my own work on heuristic decision making, are an impressive piece of work and provide much food for thought. I look forward to mutual theoretical inspiration.' Gerd Gigerenzer, Max Planck Institute for Human Development ‘WARNING: This book makes the case there is an important place for quantum cognition in the cognitive science community's goal of understanding the nature of the human mind. Intended positive consequences of reading it may include: psychological discomfort due to challenging of long-held assumptions and preferred methodologies, breathlessness and accelerated heart rate resulting from novel insights, initiation of new collaborations, and important unifying theoretical advances.' Kevin Gluck, Institute for Human & Machine Cognition ‘Quantum models are a valuable addition to the cognitive scientist's toolbox for understanding human information processing and decision making. This second edition of Busemeyer's and Bruza's ground-breaking introduction to the field is required reading for scientists wanting to learn about these models as well as for experts desiring to update their knowledge.' Thomas S. Wallsten, University of Maryland Explains how quantum theory accounts for many empirical findings in cognition and decision making using a common set of principles. Jerome Busemeyer is Distinguished Professor in Psychological Brain Sciences at Indiana University. He published five books and over 120 journal articles in decision and cognition. He won the Warren medal from the Society of Experimental Psychologists, and became a fellow of the American Academy of Arts and Sciences in 2017. Peter Bruza is a Professor of Information Systems at Queensland University of Technology, Australia. His research spans cognitive science, non-classical logic and information retrieval. His current research interests lie in the field of Quantum Cognition, which aims to develop a new understandings of human cognition using the conceptual framework and formalism of quantum theory.