Designed for advanced undergraduate and graduate students, this textbook explores both the psychological and biological influences on the development of behavior, using data from both animal and human subjects to support principles and hypotheses. The arrangement of the book is both chronological and topical, commencing with embryonic behavior and the influence of prenatal exposure to hormones and teratological agents and moving on to postnatal maternal influences and early stimulation. Play, learning and memory, and finally weaning and puberty complete this volume. This comprehensive work provides a history of this subdiscipline from the earliest research of Wilhelm Preyer in 1885 to the most recent findings on the psychobiology of behavioral development.