The results of this experiment were presented at the 11th International Ethological Conference, Rennes, France, September 2-5, 1969. (MH)

Results indicate that (1) babies have better concept of person than object as permanent, but there are important individual differences, (2) rate of person permanence development is related to infant-mother attachment, and (3) rate of person permanence development affects object permanence development. (MH)

Findings support the general hypothesis that the nature of parent/infant interaction and infant development assessed at 12 months is anticipated by a complex pattern of variables, beginning with the parents' characteristics before the birth of their first child and extending via parent/infant and infant behavior throughout the first year of life.…

Results support previous findings of interactional differences during early infancy between mother/premature and mother/full-term infant dyads. Preterms performed significantly below full-terms on measures of cognitive and language development corrected for gestational age. (Author/RH)

Data support three conclusions: (1) that notable individual differences in the interaction patterns of mothers and Down syndrome children exist, (two) that maternal directiveness and sensitivity are separable dimensions of maternal style, and (3) that individual differences in mother/child interaction patterns may be related to mental development…

Investigated effects of changes in temporal organization of material play participation upon variety of infant and maternal social interactive variables. Results confirmed hypothesis that both three- and five-month-old infants recognize temporal changes and respond differentially to natural, slower, and faster temporal styles. (Author/MP)

Presents a descriptive analysis of infant-adult face-to-face interaction, as well as the data for analyses of the relations between the two partners and the contribution of each one during the interaction. Subjects were five infants (aged 80-92 days) and their mothers. (MP)

Examines early differences in mother-infant interaction as a function of infant birth order and birth spacing. Mother and infant behaviors were observed and recorded in the home for a two-hour period. (SS)

A sample of eight 19-month-old toddlers were observed during free play at home, with and without a familiar toddler playmate. With the peer present, there was significantly more high-level play with toys and less low-level play with toys than with the peer absent. (Author/JH)

Used signal detection methodology to examine how cognitive set affects mothers' response to crying by "difficult" and "easy" infants. Found that increased mothers' sensitivity was associated with the "difficult" infant cognitive set and that mothers with high illusory control were least sensitive in detecting…

Suggests that the findings in the study by Blass and Ciaramitaro reported in this monograph support the claim that two systems of infants' behavior state regulation accessible by oral stimulation are mediated by different neural pathways. Discusses the findings in light of the immediate aims of the study itself and for the broader context of…

Mothers viewed videotapes of interaction with their 20 full-term healthy, 20 preterm healthy, and 20 preterm sick infants between 11 and 26 weeks of age. Relationships between infant gazing, laughing, and fussing and maternal interpretation of emotional state, attention preference, attention curiosity, and physical needs were analyzed. (Author/SW)

Infants participated in a nonsocial contingency task immediately after a social interaction with their mothers. The amount of time mothers and infants spent in a state of vocal turn-taking predicted individual differences in infants' subsequent performance on the contingency task. (PCB)

Examined role of mother-toddler attachment in moderating the relationships between behavioral inhibition and changes in salivary cortisol levels in response to novel events. Subjects were 77 infants 18 months old. Found elevations in cortisol only for inhibited toddlers in insecure attachment relationships. Mothers in these relationships appeared…