How are we to understand the complex forces that shape human behav- ior? A variety of diverse perspectives, drawing on studies of human behavioral ontogeny, as well as on humanity's evolutionary heritage, seem to provide the best likelihood of success. It is in an attempt to synthesize such potentially disparate approaches to human develop- ment into an integrated whole that we undertake this series on the genesis of behavior. In many respects, the incredible burgeoning of research in child development over the last decade or two seems like a thousand lines of inquiry spreading outward in an...

It is always enlightening to inquire about the origins of a research en deavor or a particular theoretical approach. Beginning with the observa tion of the mental life of the infant in 1962, Michael Lewis has contrib uted to the change in the view of the infant as an insensate mass of confusion to a complex and intellectual being. Anyone fortunate enough to have participated in the infancy research of the 1960s knows how exciting it was to have discovered in this small creature such a full and complex organism. More central to the origins of this work was the perception of the infant as an...