Examines the mental development scores for two groups of at-risk infants throughout their childhood--those classified as small for gestational age (SGA) and those twins falling below 1,750g birth weight--and determines that SGA twins showed only a modest deficit in IQ scores as compared to the full twin samples. (HOD)

Compares the separation distress of 26 19-month-old Downs Syndrome infants in the Strange Situation with that of 43 normal infants who were observed at 12 1/2 and 19 1/2 months to assess whether Downs Syndrome infants responded more similarly to cognitively comparable normals than to age-comparable normals. (HOD)

Reports the responses of 23 mothers of Down's Syndrome children to the Behavioral Style Questionnaire concerning the temperament characteristics of their child. Mothers were also interviewed with the Implicit Parental Learning Theory Scale and asked how they would handle certain specified child behaviors. (HOD)

Tested two models of the relationship between a hypothetical attachment mechanism and an incompatible motivation (a tendency to explore) by pitting two levels of attachment motivation against two levels of exploratory motivation among 15- to 18-month-old infants, alternating freely between play with novel toys at one end of the room and visits…

Observed play of 52 toddlers with a set of socially stereotyped masculine, feminine, and neutral toys in a day care setting over 14 months to (1) determine the age at which toddlers consistently exhibit sex-stereotyped toy choices in a natural setting and (2) investigate relation of parents' expectations and the children's own knowledge of gender…

Since early research had shown that a total score on 27 Piagetian tasks was very highly correlated with a Wechsler and achievement composite, a study investigated the possibility of shortening the Piagetian test by means of classical analysis methodology. (HOD)

Compared 12 right-handed adolescent females with a history of idiopathic precocious puberty to 12 closely pair-matched normal controls of similar maturational status to test the association of physical maturation with cognitive abilities and the mediation of this association by hemispheric specialization. (HOD)

Analyzes sex-related differences between mental rotation rate and spatial ability among adults, 14-year-olds, and 9.5-year-olds to determine the extent to which rotation rate is a correlate of various abilities. (HOD)

Reports on data collected in nine age ranges from 18 months to 71 months that examined children's ability to understand emotion-descriptive adjectives when used by adults and their own use of these words in productive vocabulary. (HOD)

Demonstrates the usefulness of the inclusion paradigm as a methodological tool in providing information about the conceptual breadth of selected social and nonsocial superordinate categories in children who exhibit some degree of inclusion logic. (HOD)

Results of a study of 10- and 11- month-old infants support Piaget's hypothesis that practical, action-based knowledge during infancy is involved in achievement of spatial understanding and that the experience of self-initiated locomotion contributes to spatial development. (Author/NH)

Focuses on whether 9- and 12-month-old infants understand that an object has been deleted from its initial hiding place as part of its displacement to a new location. (Author/NH)

Evaluates infants less than 1 week of age in a habituation-recovery paradigm for evidence of ability to detect an invariant identity or nonidentity relationship between components of a visual stimulus. (Author/NH)

Full-term and preterm infants who had participated in studies of cross-modal and intramodal transfer at 12 months of age were seen at older ages to assess the predictive validity of these early measures for later cognition. (Author)

In three experiments, 5-month-old infants discriminated between a perfectly contingent live display of their own leg motion and a noncontingent display of self or a peer. They showed this discrimination by preferential fixation of the noncontingent display. (Author/NH)