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)

Twenty 18-month-olds were observed interacting with their mothers and fathers in a structured laboratory setting. Assessed were affiliation and attachment behaviors when the infant was alone with either the mother or father or with both parents and when stranger entered. (Author/MS)