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This book focuses on the application of behaviour genetic approaches to twin studies, and reviews diagnostic to Attention Deficit Hyperactivity Disorder (ADHD), the relationships between reading, spelling and ADHD, and family and genetic influences on speech and speech and language.

Twin Mythconceptions: False Beliefs, Fables, and Facts about Twins sheds new light on over 70 commonly held ideas and beliefs about the origins and development of identical and fraternal twins. Using the latest scientific findings from psychology, psychiatry, biology, and education, the book separates fact from fiction. Each idea about twins is described, followed by both a short answer about the truth, and then a longer, more detailed explanation. Coverage includes embryology of twins, twin types, intellectual growth, personality traits, sexual orientation of twins, marital relationships, epigenetic analyses, and more. Five appendices cover selected topics in greater depth, such as the frequency of different twin types and the varieties of polar body twin pairs. This book will inform and entertain behavioral and life science researchers, health professionals, twins, parents of twins, and anyone interested in the fascinating topic of twins. Identifies common misunderstandings about twins Provides scientific answers to questions about twins Encompasses the biology, psychology, genetics, and personality of twins Includes discussion of identical, fraternal same-sex, and fraternal opposite-sex twins Allows for quick answers to common questions and more detailed explanations

Exploring Twins presents an analysis of twinship considered as a specifically social phenomenon. Drawing upon a wide range of interdisciplinary, historical and cross-cultural data, Dr Stewart argues that in both traditional and modern societies, twinship represents a recurrent anomaly which calls into question the assumptions around which different types of society are organized. Part One identifies and analyses the fascinating range of cultural and disciplinary approaches to the interpretation of twinship, while Part Two considers the possibilities for a distinctively social analysis of twinship.

Personality Differences and Biological Variations: A Study of Twins details a study aimed to discover the genetic uniqueness of twins and the biological basis of their individual differences. Coverage of the book includes the details of the project – its aims, method, its theoretical background, sample selection and the description of the sample; personality traits in twins the sociability/impulsivity and the Foulds hostility scale; and the influence of age and separation. The book also covers some aspects of cognitive function in twins – divergent thinking and the analysis of its measures; conceptual thinking; and the relationship of personality and cognitive function. The book also includes twins'physiological measures; their sedative drug tolerance; and a nervous typological analysis of their personal variaton. The text is recommended for psychologists who wish to learn more and study about how twins think and how they get along with one another.