Examined whether early individual differences in look duration were related to general mechanisms of the infant nervous system combining attention and emotion. Found significant positive correlations between attention measures and duration of facial expressions of pain/distress after vaccinations at 3, 5, and 11 months. Concluded that individual…

Used an event-based approach to study the nature of coordination in 3- and 6-month olds during interaction with their caregivers. Found that infants coordinated their vocalizations and facial actions more than expected by chance. When two communicative events were temporally associated across modalities, one event tended to be embedded within the…

Investigated relationship between speech and gestural proficiency at six-month intervals from 2 years to 3 years 6 months in five French-English bilingual boys. Found that from 2 years on, many aspects of gesture use were like those of adults. Iconic and beat gesture use showed differential development in French and English related to mean length…

Two studies examined messages conveyed in infant-directed lullabies and play songs. Findings indicated that adult raters differentiated audio recordings of mothers' lullaby- and play-song-styles with 100% accuracy and performed at above chance level in identifying which music 6-month olds were hearing on silent videotapes. Infants focused…

Examined relationship between children's ability to infer the veracity of an adult's statement and the adult's informedness. Found that children tended to believe utterances from speakers who were better informed than they themselves were and to disbelieve less well-informed speakers, with no age-related differences. Children gave explicit…

Used latent variables path analysis to examine models linking parents' and kindergartners' expressed affect during parent-child play and children's social functioning with peers in kindergarten and first grade. Found that relations between parental positive affect and children's social competence were mediated by children's expressed positive…

Examined deception and false-belief understanding in preschoolers following noncompliance. Found that over half of 3- and 5-year olds touched a prohibited toy during experimenter's absence and most denied it. Almost all preschoolers looked into a forbidden box, most denied it, and a minority consistently feigned ignorance of contents. False-belief…

Examined association between maternal responsiveness during infancy and middle-childhood behavior problems. Found that responsiveness was significantly associated with disruptive behavior problems but unrelated to attention problems. Absence of MRes during infancy increased risk of later disruptive behavior problems, even with concurrent parenting…

Used daily telephone interviews and simulations to compare maternal behaviors and cognitions within power bouts and single acts of noncompliance. Found that the power bouts formed a special class of discipline episodes distinct from single noncompliance. Mothers reported more negative perceptions of the child and more aversion during extended…

Examined the etiology of individual differences in literacy, phonological awareness, and language ability in monozygotic and dizygotic twins. Found that there was no genetic link between phonological awareness and literacy independent of general language ability. Individual differences in literacy ability were substantially influenced by genetics…

Investigated links between maternal employment, marital satisfaction, and fathers' parenting during their child's infancy. Found that fathers whose wives worked part time or less were more sensitive and responsive when more involved in caregiving; men whose wives worked full time showed more negative affect and behavior when more involved in child…

Examined performance of first through sixth graders on conditional-inference task, using causal conditionals and a generation of alternatives task. Found a steady age-related increase in uncertainty responses to two uncertain logical forms and an increase in production of disabling conditions for "modus ponens." Individual differences in inference…

Examined television viewing over three years among two cohorts of 2- and 4-year olds. Found that viewing declined with age. With age, time in reading and educational activities increased on weekdays but declined on weekends, and sex differences in time-use patterns increased. Increased time in educational activities, social interaction, and video…

Investigated genetic and environmental contributions to relationship between family and school environment and depressed mood; also potential sex differences in genetic and environment contributions to variation in and covariation between family connectedness, school connectedness, and depressed mood. Subjects were 2,302 adolescent sibling pairs.…

Examined sex differences in 4- to 6-year olds' spatial skill. Found that performance on spatial transformation task showed a substantial male advantage by age 4 years 6 months, with the advantage no more robust for rotation than for translation items. Comparable vocabulary task performance indicated that male advantage on spatial tasks was not…