Infant sleep is a major source of concern for many parents. The aims of this longitudinal study were to assess: (a) the development of sleep patterns among infants, (b) the development of maternal cognitions regarding infant sleep, and (c) the relations between these domains during the 1st year of life. Eighty-five mothers were recruited during…

Research on the development of metamemory has focused primarily on children's understanding of the variables that influence how likely a person is to remember something. But metamemory also involves an understanding of why people occasionally misremember things. In this study, 5- and 6-year-olds (N = 38) were asked to decide whether another…

Mother-child planning was examined in relation to child emotional functioning and first-grade school performance. Ninety dyads were randomly assigned to the explicit-goal condition (emphasized accuracy and preparation for a child-only posttest) or the no-explicit-goal condition (dyads just asked to work together). In the no-explicit-goal condition…

As children become proficient readers, there are substantial changes in the eye movements that subserve reading. Some of these changes reflect universal developmental factors while others may be specific to a particular writing system. This study attempts to disentangle effects of universal and script-dependent factors by comparing the development…

A randomized prevention design was used to investigate a moderation effect in the association between a polymorphism in the "SCL6A4"("5HTT") gene at 5-HTTLPR and increases in youths' risk behavior initiation. Participation in the Strong African American Families (SAAF) program was hypothesized to attenuate the link between 5-HTTLPR status and risk…

Associations between parenting quality and 3-year-olds' school readiness, receptive, and expressive language were examined in relation to the amount of time they spent in childcare, based on data from the NICHD Study of Early Child Care and Youth Development (N = 1,364). Associations for school readiness and receptive language were stronger among…

Numerous studies over the past decade support the claim that infants are equipped with powerful statistical language learning mechanisms. The primary evidence for statistical language learning in word segmentation comes from studies using artificial languages, continuous streams of synthesized syllables that are highly simplified relative to real…

Three models of the prospective relations between child maladjustment and peer victimization are examined: (a) internalizing results directly from victimization, (b) internalizing leads to victimization, and (c) physical aggression fuels retaliatory victimization that leads to increases in internalizing over time. Data came from assessments of…

During childhood and adolescence, increases in heritability and decreases in shared environmental influences have typically been found for cognitive abilities. A sample of more than 2,500 pairs of twins from the Twins Early Development Study was used to investigate whether a similar pattern would be found for science performance from 9 to 12…

The early noncry vocalizations of infants are salient social signals. Caregivers spontaneously respond to 30%-50% of these sounds, and their responsiveness to infants' prelinguistic noncry vocalizations facilitates the development of phonology and speech. Have infants learned that their vocalizations influence the behavior of social partners? If…

In a longitudinal study of attachment, children (N = 147) aged 50 and 61 months heard their mother and a stranger make conflicting claims. In 2 tasks, the available perceptual cues were equally consistent with either person's claim but children generally accepted the mother's claims over those of the stranger. In a 3rd task, the perceptual cues…

A controversial issue in the field of language development is whether language emergence and growth is dependent solely on processes specifically tied to language or could also depend on basic cognitive processes that affect all aspects of cognitive competence (domain-general processes). The present article examines this issue using a large…

A precisely controlled automated procedure confirms a developmental decalage: Infants acquiring English link count nouns to object categories well before they link adjectives to properties. Fourteen- and 18-month-olds (n = 48 at each age) extended novel words presented as count nouns based on category membership rather than shared properties. When…

A sample of 118 predominantly European American families with early and middle adolescents (M[subscript ages]=12.32 and 15.18 years) and 1 parent evaluated hypothetical conflicts between adolescents' and parents' requests for assistance versus the other's personal desires. Evaluations differed by level of need, but in low-need situations,…

Age differences in future orientation are examined in a sample of 935 individuals between 10 and 30 years using a delay discounting task as well as a new self-report measure. Younger adolescents consistently demonstrate a weaker orientation to the future than do individuals aged 16 and older, as reflected in their greater willingness to accept a…