Examined consistency of hand preference in a longitudinal study of children between 18 and 42 months of age. Results showed a sex-specific relationship between hand consistence and intellectual development. Females with consistency of handedness were precocious compared to females without such consistency; the same relationship did not hold for…

A survey of assessment procedures of the newborn and of the infant during the first month of life was conducted; the survey indicated that there were instruments for evaluating the newborn and for evaluating the four-week-old infant, but there was no single procedure which included an evaluation of both the newborn and the four-week-old infant.…

During a brief play period away from the mother, the responses of 10-month-old infants were observed as a function of two factors in a 2x2 design: first, whether the mother or the infant initiated the separation and second, whether the mother was visible or not during the separation. (Author/MS)

Reports a series of studies conducted to investigate possible differences in the exploratory manipulation and play behavior of human infants 7-1/2- 11-1/2 months of age as a function of the attributes of the stimulus, the familiarity of the subject with the stimuli, the age and sex of the infants, and individual differences. (Author/CS)

Separation and greeting responses were examined in a longitudinal study of 26 infants, aged 15 to 54 weeks, observed at home. All instances of a person's leaving and entering the room during home visits were observed. The developmental trend--both onset and relative frequency--of each separation behavior was plotted at three-week intervals. The…

The effects of low, full (normal) and high birthweights on the broad range of neonatal behaviors measured by the Brazelton Neonatal Assessment Scale were investigated in a study which also attempted to replicate results of the authors' earlier study of the Brazelton Scale. Data from the original sample of 52 infants were included in the later…

This book, the first in a series on development and behavior of human infants and animals, contains a collection of articles dealing with the significance of the interaction between mother and infant and the subtle contributions that each makes to the other in shaping their ongoing dyadic behavior. It emphasizes that the infant is no mere passive…