Three groups of macaque mother/infant dyads were observed while each lived in ecological settings that differed in level of foraging demand and, hence, the amount of work each mother was required to perform to obtain her daily rations. Findings suggest that in monkeys, as in humans, when mothers are psychologically unavailable to their infants,…

Purpose of this experiemnt was to systematically investigate the behavioral effects of vertical rocking at different frequencies up to 1.5 Hz. (Authors/CB)

Results of this study indicate that learning occurred only under immediate reinforcement and that there was no developmental trend in the ability to withstand the detrimental effects of delayed reinforcement. (WY)

Attempts to determine whether the stimulus dimension to which infants respond is different in fixed-trial and infant-control methodologies. Infants 10 weeks of age were shown four facelike patterns differing along two dimensions: number of elements and extent to which elements were organized to resemble the human face. (Author/RH)

Investigates the degree to which object familiarity and motivational factors influence infants' search behavior in an object-permanence test. (Author/MP)

Responses of 80 10-month-old infants to brief maternal separation were observed in home and laboratory settings and in two conditions of maternal accessibility: mothers' exit door closed or open. Results show the importance of situational determinants in the investigation of infant attachment behavior. (Author/RH)

This study attempted to identify characteristics that distinguish approach as an attachment behavior from approach serving other behavioral systems. Locomotor approaches of 16 male and 10 female white middle-class infants to an attachment figure (mother) and to a nonattachment figure (visitor-observer) were examined under naturalistic conditions…

Preference for novelty, as measured with an exploratory behavior paradigm, was compared in 8-month-old full-term and preterm infants of matched conceptional age. Subjects were 64 infants, 32 full term and 32 preterm, with 16 males and 16 females in each group. (Author/JH)

A series of five experiments explore the 7-month-old infant's ability to discriminate among photos of faces. The infant's tendency to choose visual targets for inspection provides evidence of discrimination and recognition. (Author/JH)

Examined changes in cortisol and behavioral responses in 83 infants. Found that salivary cortisol responses before and after inoculation were high at 2 months, decreased between 2 and 4 months, remained stable, then declined again between 6 and 15 months. Found some evidence that emergence of circadian rhythm in cortisol might be related to early…

Compared expressions of attachment relationships in preterm and full-term infants and their mothers at home at 8 and 12 months of age and in the Strange Situation at 18 months. Found 84% concordance in the distinctions between secure and nonsecure classifications of the mother-infant relationship made at home at 12 months and in the Strange…

Notes that 4-month olds who show a low threshold to become distressed and motorically aroused to unfamiliar stimuli are more likely than others to become fearful and subdued during early childhood, while infants who show a high arousal threshold are more likely to become bold and sociable. Considers implications for psychopathology and relation…

Compared effects of contingent and noncontingent adult-infant social interactions on subsequent infant-controlled habituation and choice tasks of 26 infants of 3 months. Infants who experienced a prior noncontingent social interaction tended to adopt response strategies that reduced the density of stimulation during subsequent nonsocial tasks.…