Schizophrenia is a widely investigated psychiatric disorder and though there have been claims of gene association, decades of molecular genetic studies have failed to produce a single causative gene. In this book, Joseph focuses on the methodological shortcomings and questionable assumptions of previous schizophrenia family, twin, and adoption studies. His findings have major implications not only for how we understand the causes of schizophrenia and other psychiatric disorders, but also for how we understand the causes of human behaviour in general. Chapters explore the differing theoretical concepts of schizophrenia, molecular genetic research around schizophrenia, family studies, and the alternative understandings of schizophrenia and psychosis. Prominent research and studies in the field are discussed and critiqued comprehensively throughout.This book is essential reading for psychiatrists, psychologists, behavioural scientists and anyone interested in the causes of human behaviour.