My aim in this book has been to give an account of the theoretical methods of analysis of multiphoton processes in atomic physics. In this account I have emphasized systematic methods as opposed to ad hoc approaches. Both perturbative and nonperturbative methods are presented with il lustrative results of concrete applications. The perturbation theory is the primary tool of analysis of nonresonant multiphoton processes. It is developed here in conjunction with a diagrammatic language and is also renormalized to free it from the unwanted divergences which accompany the ordinary treatment when...

For a variety of reasons, there has been an explosion of interest in research on aging over the past few years. The reasons include an awareness that a large and growing proportion of our popUlation is over 65 and that research findings can contribute to their health, satisfaction, and efficiency as members of society; the fact that funding agencies have endorsed the need for more research effort in the area by setting up special programs; and also the fact that researchers themselves are turning more to practical problems as many theoretical issues (in experimen- tal psychology at least)...

The study of infant memory has flourished in the past decade for a number of reasons, not the least of which is the tremendous growth of interest in normal and pathological adult memory that began in the late fifties. Despite its common lineage to other areas of memory research, however, infant memory has perhaps been the least integrated into the mainstream. In reading the literature, one gets a sense of discontinuity between the study of infant memory and memory at all other stages of development from childhood to old age. The reasons for this are not hard to find. The techniques used to...

The small but growing body of information about auditory processes in infancy is a tribute to the ingenuity and persistence of investigators in this realm. Undeter- red by the frequent expressions of boredom, rage, and indifference in their subjects, these investigators nevertheless continue to seek answers to the intrigu- ing but difficult questions about the course of auditory development. In the spring of 1981, a group of leading scholars and researchers in audi- tion gathered to discuss the topic, Auditory Development in Infancy, at the 11th annual psychology symposium at Erindale...