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.

Since the late nineteenth century, medicine has sought to foster the birth of healthy children by attending to the bodies of pregnant women, through what we have come to call prenatal care. Women, and not their unborn children, were the initial focus of that medical attention, but prenatal diagnosis in its present form, which couples scrutiny of the fetus with the option to terminate pregnancy, came into being in the early 1970s. Tangled Diagnoses examines the multiple consequences of the widespread diffusion of this medical innovation. Prenatal testing, Ilana Löwy argues, has become mainly a risk-management technology—the goal of which is to prevent inborn impairments, ideally through the development of efficient therapies but in practice mainly through the prevention of the birth of children with such impairments. Using scholarship, interviews, and direct observation in France and Brazil of two groups of professionals who play an especially important role in the production of knowledge about fetal development—fetopathologists and clinical geneticists—to expose the real-life dilemmas prenatal testing creates, this book will be of interest to anyone concerned with the sociopolitical conditions of biomedical innovation, the politics of women’s bodies, disability, and the ethics of modern medicine.