The Progress in Infancy Research Series is dedicated to the presentation of innovative and exciting research on infants, both human and animal. Each volume in the series is designed to stand alone and contains autonomous chapters which are based on high quality programs of research with infants. These chapters integrate the work of the authors with that of other experts working in the same or related areas. The authors wish to present high quality critical syntheses bearing on infant perception and sensation, learning and memory processes, and other aspects of development. This series...