"A lucid presentation of a fascinating and ingenious new body of research."
-- Steven Pinker, Johnstone Family Professor of Psychology, Harvard University, author of The Blank Slate, How the Mind Works, and Words and Rules

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.