In the newborn, psychology and physiology cannot be separated. Because of the immaturity of the nervous system and the lack of development of inhibitions, the motor excitability of early infancy is greater than that of later life. The author describes the steps by which the patterns of response and narcissistic and libidinal cathexes develop in relation to the

care and attention received by the infant. For an understanding of the problem of providing the best environmental conditions there is great need for an analysis of the many and interdependent environmental factors, such as is suggested by this study.