In Zero Degrees of Empathy: A New Theory of Human Cruelty and Kindness Simon Baron-Cohen takes fascinating and challenging new look at what exactly makes our behaviour uniquely human. How can we ever explain human cruelty? We have always struggled to understand why some people behave in the most evil way imaginable, while others are completely self-sacrificing. Is it possible that - rather than thinking in terms of 'good' and 'evil' - all of us instead lie somewhere on the empathy spectrum, and our position on that spectrum can be affected by both genes and our environments? Why do some people treat others as objects? Why is empathy our most precious resource? And does a lack of it always mean a negative outcome? From the Nazi concentration camps of World War Two to the playgrounds of today, Simon Baron-Cohen examines empathy, cruelty and understanding in a groundbreaking study of what it means to be human. 'Fascinating ... dazzling ... a full-scale assault on what we think it is to be human' Sunday Telegraph 'Highly readable ... this is a valuable book' Charlotte Moore, Spectator 'Important ... humane and immensely sympathetic' Richard Holloway, Literary Review Simon Baron-Cohen is Professor at Cambridge University in the fields of psychology and psychiatry. He is also the Director of the Autism Research Centre there. He has carried out research into social neuroscience over a 20 year career. His popular science book entitled The Essential Difference has been translated in over a dozen languages, and has been widely reviewed.

This pioneering study looks at the effects of prenatal testosterone on postnatal development and behavior. Hormonal effects on behavior have long been studied in animals; the unique contribution of this book is to suggest a connection between human fetal hormones and later behavior. It details for the first time testosterone's effect on social and language development, opening a new avenue of research for cognitive neuroscience.The authors look at samples of amniotic fluid taken during amniocentesis at 16 weeks' gestation, and relate the fetal level of testosterone (which is present in fetuses of both sexes, although in different quantities) to behavior at ages 1, 2, and 4 years. They argue that the amniotic fluid provides a window into the child's past -- a chemical record of that child's time in the womb -- that allows informed prediction about the child's future brain, mind, and behavior. This is not the retrospective speculation of psychoanalysis, they point out, but an opportunity to study development prospectively and trace developmental precursors and causes of later cognition.The study suggests that prenatal levels of testosterone affect a range of later behaviors in children, from the inclination to make eye contact with others to the size of the vocabulary. It also suggests that prenatal testosterone level may be related to the development of typically "masculine" and "feminine" behaviors. The study's ongoing research explores whether fetal testosterone has any link with the risk of developing autism. Connecting endocrinology and psychology, the authors propose that there is a biological component to behaviors often thought to be produced by the social environment.