By approximately 6 years of age, children can use time-based visual selection to ignore stationary stimuli, already in the visual field and prioritize the selection of newly arriving stimuli. This ability can be studied using preview search, a version of the visual search paradigm with an added temporal component, in which one set of distractors…

In a previous study, we reported the first measurements of pre-movement and sensorimotor cortex activity in preschool age children (ages 3-5 years) using a customized pediatric magnetoencephalographic system. Movement-related activity in the sensorimotor cortex differed from that typically observed in adults, suggesting that maturation of cortical…

Purpose: To review and assess theory and research supporting DIR/Floortime™, a method proposed for treatment of young children with autism spectrum disorders (ASD). Methods: Published materials describing the principles of DIR/Floortime™were evaluated. Published outcome research articles were assessed for the adequacy of their design and…

When speaking to young children, adults adapt their language to that of the child. In this article, we suggest that this child-directed speech (CDS) is the result of a transactional process of dynamic adaptation between the child and the adult. The study compares developmental trajectories of three children to those of the CDS of their caregivers.…

The goal of the present study was to examine the generalizability of a model of the underlying dimensions of written composition across writing systems (Chinese Mandarin vs. English) and level of writing skill. A five-factor model of writing originally developed from analyses of 1st and 4th grade English writing samples was applied to Chinese…

Tested 13-, 16-, and 20-month olds' and 24- and 28-month olds' categorization of global- and basic-level object sets composed of prototypical and nonprototypical exemplars. Findings offer new information on the effects of prototypicality and on the process of differentiation of early global categories into more specific basic-level ones. (DR)

A spontaneous mastery measure, sampling sophistication of infants' behavior and infants' propensity to demonstrate their most sophisticated repertoire of skills, was developed and tested for predictability. Unlike a measure of executive capacity to which it was compared, the spontaneous mastery measure was highly stable across a 6-month period.…

Responds to calls for combining the ideas of Piaget and Vygotsky, discussing differences between the two perspectives. Notes that differences are found in underlying assumptions about the nature and process of development, philosophy, stages of development, developmental influences, and the integrity of cognitive structures. Suggests that, given…

Addresses the extent to which differences in Piagetian and Vygotskyan psychologies make their theories incompatible. Differences result from a Vygotskyan belief in a material primary cause for development; Piagetians do not hold this view. Explores this difference in perspective, concluding that, despite it, the two approaches are compatible. (JW)

Investigated birth-order differences in children's early vocabulary development. Compared the composition and age of acquisition of the first 50 and 100 words of 9 firstborns and their younger siblings, using a longitudinal maternal diary methodology. A small but significant birth-order effect was found for the age at which the 50-word milestone…

Examined memory functions in individuals with and without autism. Found that the group with autism performed significantly worse than the nonautistic group on temporal order memory, source memory, supraspan free recall, working memory and executive function but not on short- and long-term recognition, cued recall, or new learning ability. (MOK)

Discusses some general-causal assumptions of current neo-Piagetian research and compares them with those of French European developmentalists with regard to individual differences, developmental stages, and methodology. Discusses the developmental unfolding of mental attentional mechanisms. Highlights developmental theory problems for the…

Human capacity for language acquisition is not strictly compartmentalized, with one acquisitional mechanism for the native language and others totally unrelated to it; rather, it consists of a unified mechanism flexible enough to handle various differences in external settings. This learning system operates on the formal properties of the…

In recent research, sequences of hypotheses observed during problem-solving have been categorized according to six hypothesis sampling systems that vary in efficiency. Three systems were characterized as strategies (focus, dimension check, hypothesis check) because they always lead eventually to solution. The remainder were called stereotypes…

Examined autonomy and individuation levels within financial, residential, romantic, and family formation domains among 17- to 27-year-olds in a community-based longitudinal study. Found that subgroup differences related to family socioeconomic status, parental divorce, gender, or race were not generally attributable to educational enrollment. Both…