Provides a foundation for future experimental research on the origins in mother-infant interaction of sex differences in the development of a separate sense of self. Suggests that sex differences in the experience of a separate sense of self begin to emerge in early infancy and that mothers engage in different types of contact with sons and…

Evaluated gender differences in infant and maternal emotional expressivity and regulation with 6-month-old infants and their mothers, using Tronick's face-to-face still-face model. Found that maternal affect, matching, rate of change between matching and mismatching states, and synchrony in the play preceding the still face differentially mediated…

The authors discuss several studies which invalidate the common presumption that fathers play an insignificant role in the sociopersonality development of their infant children. It is shown that fathers are extremely salient individuals in the lives of their children, particularly their sons. (Author)

This comprehensive paper proposing the use of evolutionary theory as a basis for studies in developmental psychology includes these specific sections: (1) Developmental Theories--a brief overview, (2) Individual Differences, (3) Culture and Inbreeding, (4) Sexual Dimorphism, (5) Critical Periods in the Development of Attachments, (6) Continuity…

To test the inversion of intensity interpretation based on negative relations between newborn and pre-school intensity behaviors, 106 normal children were examined at the neonatal and pre-school periods. Interpretations of intensity behaviors at both periods and their longitudinal relations are discussed. (Author/SB)

This paper discusses the processes that are at work which produce some of the differences between male and female human beings. The sex of the child is an important attribute of the organism's identity. Before birth, parents express preferences for the sex of the unborn child and start providing names as a function of the sex of the child. Studies…

Early personality and environmental characteristics that predict later problematic aggression and depression in children were investigated longitudinally. A developmental psychopathology approach was taken. (This approach assumes that patterns of adaptation and maladaptation in development can best be understood when explored simultaneously and…

This book reports the experiential deprivation and intellectual retardation of children from the Creche, a Lebanese social agency devoted to the care of foundlings from birth to 6 years. Begun in 1955, this study explored the role of environment, specifically, the effects of adoption, on IQ. Results showed that the mean IQ for both boys and girls…