Experimentally manipulating Approximate Number System (ANS) precision has been found to influence children's subsequent symbolic math performance. Here in three experiments (N = 160; 81 girls; 3-5 year old) we replicated this effect and examined its duration and developmental trajectory. We found that modulation of 5-year-olds' ANS precision…

The present study examined whether repeated exposure to daily surveys about negative social experiences predicts changes in adolescents' daily and general maladjustment, and whether question content moderates these changes. Across a 2-week period, 6th-grade students (N = 215; mode age = 11) completed 5 daily reports tapping experienced or…

This microgenetic study examined social influences on children's development of analogical reasoning during peer-led small-group discussions of stories about controversial issues. A total of 277 analogies were identified among 7,215 child turns for speaking during 54 discussions from 18 discussion groups in 6 fourth-grade classrooms (N = 120; age…

Fetal neurobehavioral development was modeled longitudinally using data collected at weekly intervals from 24 to 38 weeks gestation in a sample of 112 healthy pregnancies. Predictive associations between 3 measures of fetal neurobehavioral functioning and their developmental trajectories to neurological maturation in the first weeks after birth…

Parents' physiological regulation may support infants' regulation. Mothers (N=152) and 6-month-old male and female infants were observed in normal and disrupted social interaction. Affect was coded at 1-s intervals and vagal tone measured as respiratory sinus arrhythmia (RSA). Maternal sensitivity was assessed in free play. Mothers and infants…

This study of the nature of the representations underlying children's knowledge of the pattern of daily activities tested the plausibility of three models that have been proposed to explain adults' representations of temporal patterns. The models could also account for previous demonstrations of young children's knowledge of the temporal order of…

Four studies explored children's ability to differentiate future distances of events. Findings indicated that 4-year-olds failed to differentiate future distances. Five-year-olds could distinguish events occurring in coming weeks/months from those many months away. Six- through 8-year-olds made more differentiated judgments than younger children…

Study found that stimulus presence during a delay of reinforcement interval enhanced performance, and to a large extent prevented the usual delay-produced decrement. (Authors)

Preferential looking at stimuli varying in temporal frequency was examined in 11 prematurely born infants. The relationship between amount of looking and stimulus frequency yielded a significant linear trend with the fastest frequency used (4 hertz) being most preferred. (Author/DB)

Used multilevel analyses to examined the amounts of time infants spent asleep, awake, content, feeding, fussing, and crying at 2, 6, 12, and 40 weeks of age. Found that day-to-day fluctuations accounted for between 44 and 53% of the variance in amounts of time sleeping, fussing, and crying. (MDM)

Thirty-six pairs of mixed-sex siblings were observed for two 1-hour periods in their homes. The younger siblings averaged 20 months of age and the interval between siblings was either large or small. Results are compared with a previous study of same-sex sibling interaction. (Author/RH)

An investigation to account for age changes in the accuracy with which children match auditory to visual series. (Author)

Examined the effects of age, repetition, and retention interval on children's memory of the final occurrence of a repeated event. Found that repetition increased the number of items recalled, and that younger children showed a poorer ability to discriminate between the occurrences than the older children, though age differences were less evident…