Seventy 15-month-old infants were studied at home before starting child care, during adaptation (mothers present) and separation (first 9 days without mothers) phases, and 5 months later. Security of infantmother attachment was assessed before and 3 months after child care began. In the separation phase, salivary cortisol rose over the first 60…

Event-related potentials (ERPs) were recorded from infants shown sets of familiar faces presented frequently and infrequently, and a set of novel faces presented infrequently, and correlated with infant emotional behavior and cortisol levels. Found that infants scoring higher on the normative ERP factor were more distressed during parent…

Examined the influence of social context variables on separation responses in nine-month-old infants. Indicated that nine month olds need not be highly stressed by being put in a new setting with a substitute caregiver. Use of procedures practiced in a model day care program effectively buffeted infant stress responses under individual and group…

Reviews research on the functioning of the hypothalamic-pituitary-adrenocortical system in normal infants. Special attention is paid to the environmental stimuli and psychological processes regulating the stress responses of this system. (NH)

Examines the effect of an unfamiliar peer in a situation requiring a subject's separation from mother in order to play with attractive toys. Observation of 20 children 18 months old and 20 children 30 months old revealed that peer presence facilitated initial separation for both ages, but that age differences in subsequent behaviors existed. (CB)