Assessed age-related changes in 2- to 4-year olds' verbal and nonverbal memory for the same unique event. Found that children's performance on each memory measure increased as a function of age. Children with more advanced language skills reported more during the verbal interview and exhibited superior nonverbal memory relative to children with…

A bootstrapping procedure was used to determine whether preverbal infants at 3- and 6-months sequenced (1) vocalizations, (2) gazes at their mothers' faces, and (3) facial expressions into pairs of coordinated patterns nonrandomly. Findings indicated that smiles and frowns were highly coordinated with vocalizations. Smiles were also coordinated…

Two studies examined 9- to 15-month-olds' ability to deduce an abstract nonmatching rule from reward feedback. Results showed that physical connectedness between stimuli and reward was key to performance. In the absence of the perception that stimulus and reward were components of a single thing, even close spatial and temporal proximity were…

Examined the role of same-sex peer interactions in influencing early school competence and the degree to which effortful control (EC) moderated these relations. Results indicated that EC, measured at the end of the Fall semester, moderated the relations of children's same-sex play to their school competence, measured at the end of the following…

Four experiments examined the processes underlying children's understanding of desire and assessed whether young children's difficulty with false belief could be explained by desire's dominance over belief. Findings indicated that for 3-year-olds, there was no correspondence between desire and belief, suggesting that desire cannot explain their…

Observed 10-, 26-, and 42-month-olds playing under several distraction conditions to describe development of attention and distractibility. Found that casual attention decreased and focused attention increased with age. Ten-month-olds were more distractible than older children, even during focused attention. Infants were most distracted by the…

Compared 28- to 53-month-olds' writing and drawing. Scores on a writing scale composed of graphic, "writing-like," and symbolic schemes improved with age. Recognition of drawings as drawings preceded recognition of writings as writings. Writing and drawing scores were substantially correlated, even with age partialed out, suggesting that when…

Twelve- and 18-month-olds played with 2 adults and 2 new toys. For a third toy, one adult left the room while the child and other adult played with it. This adult returned, looked at the 3 toys, expressed excitement, and asked "Can you give it to me?" Infants at both ages were able to do so, suggesting that 1-year-olds understand other persons as…

At 3 points in time over a 12-month period, this short-term longitudinal study examined 67 preschoolers' syllable, rime, and phoneme awareness; speech and language skills; and letter knowledge. Findings indicated that rime skills developed earlier than phoneme skills. Structural equation models showed that articulatory skills and syllable and rime…

This study modeled physical and psychosocial aspects of home environment and personal characteristics in a cumulative risk heuristic. Found that elevated cumulative risk was associated with heightened cardiovascular and neuroendocrine parameters, increased deposition of body fat, and higher summary index of total allostatic load. Replicated…

Applied a semiparametric mixture model to a sample of 284 low-income boys to model developmental trajectories of overt conduct problems from ages 2 to 8. Identified four trajectories: persistent problem, high-level desister, moderate-level desister, and persistent low. Initially high and low groups were differentiated in early childhood by high…

Examined relations between TV-violence viewing at ages 6 to 10 and adult aggression about 15 years later for sample growing up in the 1970s and 1980s. Found that childhood exposure to media violence predicted young adult aggression for males and females. Identification with aggressive TV characters and perceived realism of TV violence predicted…

Data from 6 sites in 3 countries were examined to determine developmental course of physical aggression in childhood and to analyze linkages to violent and nonviolent offending outcomes in adolescence. Findings indicated that among boys, chronic physical aggression during elementary school years increased risk for continued physical violence and…

Investigated potential differences between nonreferred children with and without callous-unemotional (CU) traits. Found that children with conduct problems, irrespective of CU trait presence, tended to have significant problems in emotional and behavioral regulation. CU traits, irrespective of conduct problem presence, related to a lack of…

Used a genetic design to investigate association between physical aggression and language development in 19-month-old twins. Found a modest but significant correlation between aggression and expressive vocabulary. Substantial heritability was found for physical aggression. Quantitative genetic modeling suggested that the correlation could not be…